Change Details

I could also change BKE prefixes on moved functions, but I thought it would be better to do in separate commit so there is less noise in terms of affected files.

Move functions closely related to rendering images and proxies into `render.c` and `proxy.c` files. `render.h` and `proxy.h` are created for functions used internally. There should be no functional changes.

I could also change BKE prefixes on moved functions,Move functions closely related to rendering images and proxies into `render.c` and `proxy.c` files. but I thought it would be better to do in separate commit so t`render.h` and `proxy.h` are created for functions used internally. There is less noise in terms of affected filesshould be no functional changes.