Move common_defs to angel-player/.../content/
Add dev.sh.

Because we really don't need build.sh to develop angel-player.
Port dev.sh to cygwin (git bash).
Add dev.bat for Windows development without bash.
Update README to README.md
Add build-angel-player.sh.

This script has the fewest dependencies to build and test angel player.
Categorize dependencies in README.md
Refactor dependencies for build-angel-player.sh.

Now, you can build angel-player with only the essentials and emcc.
Add lint-angel-player.sh

Because rebuilding version.c 8 times to check some javascript is dumb.
Describe build refactor in README.md
Update README.md to emphasize OS independence.
Only use Main Process for remote debugging.

It can clearly be used to debug css without problems.
Add branding info.

Among nice things this provides, viewSource.xul will actually work.
Describe debug footer in README.md
Clarify what needs the ui Slow-Start.