fb: Handle navbar heights correct on dpi changes + more (1/2)

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)
- as well this commit disables movable navbar for tablets (we may will enable
  it in future but it needs a lot more work to have it on tablets correct working)
- add Converter class for common methods we always use....till now only px->dp
  and dp->px method

Change-Id: Ib962b2cd62c991fe4d6f3b6b27b5d97c9ec653b0

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
Frameworks: Imagehelper...do a nicer resize with better quality

fix some build error due to last commit

Change-Id: I209afc73ef6a69c919c0d504d34de72525bc5b0d