Add Android Interface Definition Language.

[qwandor]

Description

Adds support for AIDL, the Android Interface Definition Language, including syntax highlighting.

Checklist:

• I am adding a new language.
  • The extension of the new language is used in hundreds of repositories on GitHub.com.
    • Search results for each extension:
      • https://github.com/search?utf8=%E2%9C%93&type=Code&ref=searchresults&q=extension%3Aaidl+NOT+nothack
  • I have included a real-world usage sample for all extensions added in this PR:
    • Sample source(s):
      • https://cs.android.com/android/platform/superproject/+/master:cts/tests/tests/binder_ndk/libbinder_ndk_test/test_package/ExtendableParcelable.aidl
      • https://cs.android.com/android/platform/superproject/+/master:system/vold/binder/android/os/IVold.aidl
    • Sample license(s): Apache 2.0
  • I have included a syntax highlighting grammar: https://github-lightshow.herokuapp.com/?utf8=%E2%9C%93&scope=from-url&grammar_format=auto&grammar_url=https%3A%2F%2Fraw.githubusercontent.com%2Fgoogle%2Faidl-language%2Fmain%2Fsyntaxes%2Faidl.tmLanguage.json&grammar_text=&code_source=from-url&code_url=https%3A%2F%2Fraw.githubusercontent.com%2FDotOS-GSI%2Fandroid_hardware_interfaces%2Fae7110d6ed95d3f34abe9a42ddb6f074607afc2d%2Fpower%2Faidl%2Fandroid%2Fhardware%2Fpower%2FMode.aidl&code=
  • I have updated the heuristics to distinguish my language from others using the same extension.

[lildude]

LGTM.

You've just missed the last release so GitHub.com won't gain support until the next release is made which will be in about a month's time.