Blender Git Loki

GP Modifiers - Merge Array and Duplication modifiers

Array and Duplication modifiers basically implemented the same functionality,
except that:
1) Array was slightly more powerful (i.e. it could make a 3D grid instead of
just putting everything in a single line), and
2) Array created new objects when "Applying", while Duplication added to the
current datablock

This commit basically merges the functionality of both into the Array modifier.
I ended up recoding this modifier to hopefully work a lot faster.
* The resulting modifier more closely resembles the behaviour of the normal
Blender Array modifier.
* Performance should be better now with over 25 objects (previous array modifier
implementation lagged badly with more than 25-30 instances). The previous approach
of manually creating objects didn't work too well.

TODO:
* The functionality to disable the instance creation when the simplify options
are enabled is currently lost. Still need to figure out how to restore it
* The stubs/shell for the old Duplication modifier are still around. To be removed!