Improve Licensing

[PhoneDroid]

Heyo, improved the licensing a bit.

Note

Note that in this PR I added an editorconfig so we use the same basics for code ( line endings and such ). -> The last commit is a reformat based on the config which also shows all the conflicts I had to work around for the actual licensing related commits.

Changes

• Added SPDX License Identifiers
• Added SPDX File Notices
• Updated copyright headers
  • Used the 2.1 text + This addon instead of This library
  • Used a proper Python comment block
  • Ensured each copyright statement is on one line
• Used the proper license file
• Corrected the manifest license id