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* Fix project loading with bad text-number connections

Change-Id: I78c1666fd34346e46e68e112d02603e4de197fa5

* More thoroughly fix number detection and add unit tests

Change-Id: I52e646cbfab94cf4a317c9149146bd01fd0da49a

* Add drag-and-drop of resources into App Inventor workspace

This commit improves the usability of App Inventor by enabling drag
and drop capabilities using HTML5. Users can drag projects, keystores,
extensions, and assets into the App Inventor workspace to upload
them. Extensions and assets are only added if the project editor is
open.

Change-Id: I5373a384cb8d115b23f946659b3151a2040b42b8

* Support drag and drop with uri-lists

Change-Id: Ia9e5d800760736a220e2795c4868b393b82afd4a

* Implement checkstyle rules for App Inventor

This commit implements checkstyle for App Inventor's Java code. The
App Inventor style rules are based on the Google style rules, with an
exception added for methods in the components/runtime package that are
annotated with `@Simple*` or `@Design*` annotations. The App Inventor
specific rules are placed at the end of the appinventor_checks.xml
file.

In addition, there is a script called checkstyle_git.py that is
written in Python 3 and will check the git diff against the rules by
running checkstyle on the changed files and crossreferencing the line
numbers with the checkstyle output. This can be used as a git
pre-commit hook to check that changes conform to the style guide. The
script returns -1 on error, which will abort the commit until the
changes confirm. This behavior can be bypassed by exporting the
BYPASS_CHECKSTYLE environment variable.

These two changes are made available as ant targets:

- `ant checkstyle`: Run the checkstyle_git.py script to check the
  git diff for problems.
- `ant checkstyle-all`: Run checkstyle on the whole repo (slow).

Change-Id: I26c6049bd49d1ce3f9b8dbd48f8f115a89fb5b52

* Revamp checkstyle-git script logic

Change-Id: Ie417057b2d009ba70279e70df102851b2f4552cd

* Add custom checks for EventDispatcher in @SimpleEvent

Change-Id: I72a704e9f8d489aa08cefd50ca180b1130b3e5fa

Change-Id: I986ce001d40ff7ea4423e7a21d29e3fad3e2eabc

Change-Id: Icebd59c7b7a7e112f42514a3531cb78ef1537c01

Change-Id: I7aef0856d098b490d36d36d410dc9763ccb5a034

Cleanup the code that deals with detecting connection failures. This
change results in a more stable experience on Firefox. It also ensures
that any closed WebRTC connection is cleaned up properly. This means
that if the Companion disconnects due to the Companion being closed, or
a network failure, a new connection can be made reliably without having
to reload App Inventor in the browser.

Change-Id: I35ccba26729d7c870201165cb3821991a6f523ee

Change-Id: I9a411efca491ad548a9d8560d50b8e8fdb0ef752

Change-Id: I04821ae6834300478a31556aca32b6ef48367dd9

It turns out that the iceConnectionState on the connectionStateChange
event is about a particular ICE Candidate pair, which may not be the
selected and in use candidate pair. However checking the
iceConnectionState on the WebRTCPeer object itself yields the state of
the “selected” and in use candidate pair.

Change-Id: I7d14041300ce82a02fd1bd04b9a940f26216d802

Permit the MIT App Inventor programmer to provide their own Yandex API
key. If they do not provide one, the builtin key (for the MIT
deployment) will be used.

Having neither a user provided key or builtin key results in an error.

Change-Id: Ieb25514437133162b68fae7741ffdce5a8463d04

Co-authored-by: Li Li <lili2014@Lis-MacBook-Pro.home>

Change-Id: I4ef111feb8f7734884577c5ea50055a35bdfe1c7

Change-Id: I11239726d38d09658b9d627dc0174932f7820c16

Change-Id: Iadbfae002175a409b928f5c7e705c85cdb70566d

Change-Id: Id459b7a5963b8a8e2d64a674e0f35090621fac6a

Change-Id: Ib4d3034c2ce901b26d03f26afb43943f3bef44d2

Change-Id: Ic3a3b7a93ada8fcfe649f6772d7121041c5c9dc5

Change-Id: I9ef4fdb1bda35fbd023e908b41fa9aa5cc1b5e43

Refactors the context menu options into individual functions. Adds the
"Generate Yail" option to component event blocks.

Change-Id: I7ce9138f8d58bd1b9abd9b26adf16ce84770afc7

Add Kodular implementation of a Magnetic Field Sensor, which can be used to detect changes
in the magnetic field around the phone. It is useful, for example, to interact with magnetic
buttons and trigger actions.