Add all possible flags to the front end.

A complete set of flags for the CLI tool can be found in this script:
https://source.corp.google.com/android/build/make/tools/releasetools/ota_from_target_files.py

Now most of the flags are being added to the front end. However, there
are several TODOs:
1. flags that require extra arguements or file operations are not
supported yet.
2. the flags can depend or exclude on other flags. Dependency is
included in file 'JobSubmissions.js'-'OTAExtraFlags'. But the function
is not implemented yet.

Test: Mannual tested.
Change-Id: I3b6b76d48861cff81bfad86b549ff53f6536933b
3 files changed