Settings: new dslv + Dialog handling

dslv get some tweeks to be perfect
- dialogs get instance handling
- icons show all in same size independent which icons they are
- option "none" is on normal action not available and gets filtered

Other settings:
- clean up a bit
- use more centralized strings
- dialog get instance handling
- add missing landscape layout settings for color picker

Change-Id: Icc334b3f1940188492133ac50e04800ecb41d093