Blender Git Commit Log

Added back defines of "opcodes" for opearation nodes

These are essentially identifiers we can use for quickly checking or searching
for particular types of operation nodes from a component, without resorting
to dynamically building identifier strings or other crazy stuff like that.

* Unlike in the past, these are stored on the OperationDepsNodes themselves.

* Not all operations need to have an identifier defined. Only those operations
which are very common or important must have one. All others can simply
reuse the generic "DEG_OPCODE_OPERATION" with a suitable string

* These are defined in a separate header, which is designed to be used like UI_icons.h
to create a set of printable string ID's for nicer debug printing