Adjustable picture modulus: Base patch by BradleyS, Thanks BradleyS!

Adjustable picture modulus: Base patch by BradleyS, Thanks BradleyS!
- Enables setting modulus for all anamorphic modes (including non-anamorphic) except strict. The job variable "anamorphic.modulus" is repurposed for this and is renamed to simply "modulus"
- Other changes: Increases minimum output dimensions to 32x32 pixels in libhb (prevents possible crashes, notably in macgui). Better crop value and maximum crop value calculations to prevent crashes. Some code optimization / refactoring.

git-svn-id: svn://localhost/HandBrake/trunk@3113 b64f7644-9d1e-0410-96f1-a4d463321fa5