Blender Git Loki

Cleanup Collada: Added new low level functions for later usage

bc_get_action_id() : To create unique Collada conform identifiers

The following new functions handle conversions of matrices
to various forms:

bc_copy_darray_m4d() : Copy matrix to an array of floats
bc_copy_v44_m4d() : Copy matrix to a vector of vectors of floats
bc_copy_m4d_v44() : opposite of previous function

Note: The vector<vector<double>> matrix is needed so that i later can
easily store matrix data in another vector (containing matrix curves)