[WIP] SlimPIE (2/2)

Ported from CM sources by @cristianomatos

Change-Id: I10e026e76748b1e273d38a983ea873a7076b124d
Settings: Handle navbar heights correct on dpi changes + more (2/2)
Till now we set the height in px in the settings. Which is a problem
especially on multiDPI roms like we are when the user afterwards changes
the dpi due that it isn't calculated correct anymore on the new dpi.

This commit does
- save the dp value in provider and calculate the real px in fb
- clean up the settings stuff for it + do it a bit nicer (only settings part
  where we do not set the value for the listview)
- add Converter class for common methods we always use....till now only px->dp
  and dp->px method

Change-Id: Icf9754ee496ae3cc6d998f58a1dc543d0a7383ee
SlimPIE: only allow interaction only if navbar is disable

Change-Id: Iced3c02d975386b92eee07ae2d249f79f4876f16
Revert "SlimPIE: only allow interaction only if navbar is disable"

This reverts commit 2fdd1df33ce5bf7b1efcd57782c59e5d18b32f47.
Toggle nav bar through power menu (2/2)

- This is highly based on this commit form SlimRoms: https://github.com/SlimRoms/packages_apps_Settings/commit/30482e059fb55b9d3aa4d461a0715d77ec70776a
- Now we can toggle nav bar on/of in power menu. It's easier to use PIE.

Thanks again to @kufikugel

Codes ported and new codes from @cristianomatos

Change-Id: I63c686ebd19d3a50afe3d71de191e484208000f2
PT-BR translations

Change-Id: I0e17588076f841ab15298eb42e8fcc2aaf00e15e