WIP Simplify Android colour structure

[dpogue]

Platforms affected

Android

Motivation and Context

To avoid run-time parsing of colours from config.xml, it would be best if the prepare step could set the colours properly in cdv_colors.xml as resources.

Description

Restructured the cdv_colors.xml file so that the default/system background is a separate variable that gets changed based on .

• Set up cdv_background_color so it defaults to the system background
  • To be set from the BackgroundColor preference in config.xml
• Added a cdv_status_bar_background color resource that defaults to transparent
  • To be set from the StatusBarBackgroundColor preference in config.xml
• Retain cdv_splashscreen_background defaulting to the cdv_background_color
  • To be set from the SplashScreenBackgroundColor preference in config.xml

TODO

• Actually setting the colour override values during prepare based on the preferences

Testing

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.20%. Comparing base (a9a4511) to head (e309e6d).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2016   +/-   ##
=======================================
  Coverage   63.20%   63.20%           
=======================================
  Files          24       24           
  Lines        4922     4922           
=======================================
  Hits         3111     3111           
  Misses       1811     1811           

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