Settings: SlimPIE the second (2/2)

This commit changes the following:
- add possibility to set trigger height on the left and right trigger
- add possibility to set gravity on the lef and right trigger
- change touch detection logic and calculation (it shows now up immediately...super fast :p)
- reduces values in dimens.xml because of the new touch detection much lesser are needed
- remove on settings the shown values on the left @seekbar on entries where it does not make sense
- reset menu for trigger dimensions
- minor string changes
- cleanup
- minor bugfixes

for me it is now like a PIE should be lol

cheers

Change-Id: Ib31025a05b94da6718d2ff66178a7657075e4c90
Settings: SlimPIE second layer (2/2)

I promissed yesterday to stop working on SlimPIE....but due
team and user whishes I decided to do a last tweak so that
all are happy.

This commit introduces the following:
- enable second buttons row
- up to 7 buttons + 7 longpress buttons
- usual customizations on that buttons
- means it is possible to add 5 + 5 on first row and 7 + 7 on second row
- resource friendly...reusing most of present code
- new introduced observer for second row is just
  observing when second row is really enabled
- due optimizations we can hold the speed and responsive we
  introduced yesterday on same level
- reduce default size back to 1
- some minor changes

Now SlimPIE is finished

Screenshots (first shows default values for first and second row):
https://dl.dropboxusercontent.com/u/106208842/Screenshot_2013-05-01-02-30-47.png
https://dl.dropboxusercontent.com/u/106208842/Screenshot_2013-05-01-02-36-25.png

cheers

Change-Id: Icac694022e051eb3ced986829f7196798c958b8e