This patch removes the limitations on the number of action layers in the BGE.
BL_ActionManager currently uses a fixed array to keep track of the action layers. This patch replaces the fixed array with a map which allows for dynamic allocation of action layers. Layers (map items) are automatically removed on BL_ActionManager's update function. The maximum number of layers is roughly the value of a short. Backwards functionality is maintained and there are no changes to the Python API.
Task Discussion:
https://developer.blender.org/T39572
Author: Kevin Ednalino
Reviewers: moguri
Differential Revision: https://developer.blender.org/D491
ee5284faf6