fb: TRDS 3.0 and new theme engine preparation sdk support (1/4)

First commit for public api sdk support, to give app developer a way
to add TRDS/TRLS and coming theme engine support. As well would be later
used for themer to build theming.

Of course apps will be still compatible to firmwares without that feature
as well backwardscompatible

This just adds the support

TODO:
- Proper API documentation
- Adding sample cases

Change-Id: Ic88838247c47d2a92b55d1cb1b00330f2d62fb88
TRDS: Dark DocumentsUI

for Downloads app

PS:
- fix settings

Change-Id: I87d49e97b8a0a67bd4d85f0137eb0960155428cb
fb: TRDS dark base theme

Change-Id: Ie25abfbf5258ac479ca8bc91033f6892bbbc6741
trds:[framework] dark images adjustments

Change-Id: Ie038c4a1aa535708c23f099fb5e836407e3d1603