substratum theme engine

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v1008 Changelog:
- Allow overlays to compile against split APKs
- Fix licensing issues
- Handle some more places which could trigger crashes

Older changelogs:

v1007: Fix type2 application and a couple other crashes

v1006: Cleanup Pie related code that caused regression for Andromeda users.

v1005: Resolve overlay installation issues for rooted nougat users

v1004: Hotfix for Firebase database migration issues