Some inline helper function of the included files in the header make use
of functions defined within it. This can cause a circular dependency
cycle if said helper functions are ever defined within the classes.
To break this potential cycle, we can use forward declarations.
This also has the benefit of reducing preprocessing overhead a little
bit.
* decompiled some bgs_chk funcs
* c_m3d_g
* c_math progress
* remove duplicate SComponent headers
* move some variables and decompile a function
* some inlined from debug
* cM3d_2PlaneLinePosNearPos
* fix fabsf and decompile cM3d_CrawVec
* format
* cleanup
* more cleanup
Co-authored-by: Pheenoh <pheenoh@gmail.com>