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* [skip changelog] Pass path and contents separately to SketchSaveItemCpp

Previously, these two arguments were wrapped together in a sketch.Item,
but since all callers build such an item during the call, there is no
compelling reason to do it like this. This commit splits the Item
parameter into a separate path and contents, which prepares for removing
the file contents from sketch.Item later.

* [skip changelog] Let SketchMergeSources return error

This adds an error return value, which is currently always nil. This
prepares for making changes that require returning errors.

* [skip changelog] Let sketch.Item.GetSourceStr return error

This adds an error return value to this method, which is currently
always nil. This prepares for actually returning errors later.

* Load sketch file contents only when needed

Previously, the full contents of *all* sketch files would be loaded into
memory. This includes all source and header files inside the sketch
directory, even when they will not even be compiled (e.g.
subdirectories other than src). In practice, only the .ino file contents
will actually be used, so these are now read on demand.

Note that when copying the sketch into the build directory, the contents
of all these sketch files *is* used, but that code (`writeIfDifferent()`
in `arduino/builder/sketch.go`) already did not use the preloaded data
but read the file contents when copying.

For small sketches, this does not make much of a difference, but bigger
sketches, especially when they include libraries, core definitions,
tools, examples, documentation, etc. the memory usage can quite explode,
for no good reason.

[skip changelog] Demonstrate gRPC interface's LibraryResolveDependencies method in client_example (#552)

- Demonstrate SetValue, Merge, GetValue, and GetAll.
- Switch from the deprecated configuration request field of Init to using the Settings service to configure arduino-cli's directories.

* [skip changelog] [skip ci] Clarify additional-urls option usage

* rephrase flag warning

* stress 3rd party point

* avoid paniking if main sketch file is missing

* rewrite the sketch contents collection logic + tests

* fix tests

* fix regression on board attach

* fix integration tests

* Improve error message on build failure
* properly report an error message

* remove error checking on unused proto field, added deprecation comment

* fix typo in function name

* do not os.exit in library code

* create data dir tree if it doesnt exist

* Improve error message when port or fqbn flags are missing

* Redirect stderr for integration tests too

* convert to rST
* downloads links in table
* refactored the walkthrough
* slim down install instructions

* rename Sketchbook folder to User

* missing join on path

* define proto messages and service

* run protoc on settings interface, regenerate code

* add service implementation and tests

* remove test leftovers

* use pip-tools, bump packages to support 3.8

* Bump Python to 3.8 in the CI environment

* add test for #443

* return an empty json array when there are no libs

Fix the inconsistent name of libraries when installing
and uninstalling.

* dump all settings

* init config file using viper

* remove configs package

* use viper API

* default url shouldnt be added to additional_urls

* map log settings to config file

* do not use logging before it's ready

* look for project wide config file

* Update go-serial library to latest version

Includes a fix to serial.Read method.

Should fix: https://github.com/arduino/arduino-cli/issues/504

Actual patch: https://github.com/bugst/go-serial/pull/69

* Using versioned release of go.bug.st/serial

* extend search fields for libs, added tests

* adjust tests

When only specifying folder, the logic will try both <DirName>.ino and
<DirName>.pde as the main sketch file. If both are found, and error is
also thrown (it would break on compile later on).

Added couple of unit tests also.
Signed-off-by: Lluis Campos <lluis.campos@northern.tech>

* Added infrastructure to handle 'dependency' field in library index

* Added globals.ParseLibraryReferenceArgs method

* Added check for missing library version/name in args

* Added check for missing core/arch/version in core arg parsing

* 100% test coverage for librariesindexer module

* Added grpc call LibraryResolveDependencies (WIP)

This is just the body of the call, no implementation yet.

* Use semver.Dependency interface to represent a library dependency

* Added library-dep resolution function in core modules

* Added implementation for LibraryResolveDependency grpc call

* Implementation of deps install in 'lib install' command

* Added no-deps flag in lib install command

* Added lib deps command

* Replace asciilogo.txt with donwlodads index.html as a test resource

* Remove prints and re-enable test pieces

* Fix file size

Terminate daemon command when parent process exits; added "--daemonize" flag to keep old behaviour (#488)

* daemon: terminate on parent process ending; added --daemonize flag

This is useful when the cli daemon is launched from an external process
to avoid leaving zombie process if the parent process unexpectedly dies.

If daemonization (so no stdin/stdout) is the intended behaviour the
--daemonize flag must be used.

* (cosmetic) reorganized runDaemonCommand in a more straighforward way

* add an option to show all the versions

* add all_versions option to the rpc proto

* clean up code + docs

* added integration tests