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The Arduino application path in macOS has to be expanded inside the app
bundle, so when the server tries to set a new compiler path in macOS and
sees a different path in the settings than what was originally set by the
request it thinks that it failed to set the new path correctly.
This commit fixes that.

When the input text elements for the Settings Compiler path or Sketch path
are clicked it will launch the Electron native file and folder browsers to
select a path for the selected setting.

Before this change when the "compiler" or "sketch" options were selected
in the settings the server launched a GUI file or folder browser window to
get the user to navigate the server filesystem.

This means that the server needed to be run on a desktop environment and
this feature of the application could only be used in the same computer
that is executing the Python server.

This commit removes this GUI window from the Python server, it now expects
the path to be sent from the front end interface. So for the text inputs
the user has to manually enter the file or directory paths.
This can then be extended to either offer a file browser in the html page,
or to add Electron hooks to use the native application browser.

Also updates the requirements.txt file for the Python build scripts
dependencies.
Removed the TODO list as it has been moved to the Wiki documentation.

During testing some bugs were found in the server handlers, so those have
been fixed as well.

To ensure all tests are independent when run in one go, the
ServerCompilerSettings singleton instance has to be completely dropped on
the class tear down.

Moving from SimpleHTTPServer to a Bottle + Waitress implementation of the
Ardublockly Server.
The request have been changed slightly to be more "RESTful" (but not
really) and te actions module had to be updated accordingly.
The front end JavaScript had to be updated as well to work with the new
version.

The function call block now checks what the return type of the function
definition block is, in order to determine its own type.

Also, fixes issue where some blocks had block inputs attached but no
connections (caused by mutations editing the available inputs).

This also fixes an issue when a UI event triggered a code generation,
which in turn updated a block in a way that caused a new UI event to fire
and repeat this process in a circle.

Change how Ardublockly block strings are stored and build

Fixes #162

Python 2.7 has been added by default in the Travis CI images, so no
need to reinstall it. Need to add pip, but ensure the python installation
picks the right site-packages.

Python3 brew default is 3.6, which is not compatible with PyInstaller,
so install 3.5 instead.

Look like in March DropBox has changed their download links so the
link for py2exe has been dead since.
There is also a bug in Python 2.7.13 that affects one of the
pyserial scripts, so need to install and use an older version.

The stepper motor block now offer the option to select between two and four pins. The pin number selection dropdowns are updated accordingly.