* add getters for frame poses
* fix missing joint in GetJointPose
* clean up models_iqm.cpp
* clean up usage of I_GetTimeFrac, split out matrix calculation into its own function
* clean up SetModelBoneRotationInternal
* clean up a few float <-> double and unsigned <-> signed warnings
* fix more warnings
* further clean up warnings
* split mode ObjectToWorldMatrix stuff
* initial work on bone getters, matrix hell
(the matrix/vec3 multiplications are probably wrong af, just gotta add more stuff 'till i can test it)
* clean up matrix math
* GetBone/TransformByBone
* fix GetBoneFramePose
* fix ObjectToWorldMatrix
* fix missing array resize
* raw matrix getters (for use with gutamatics/etc)
* reverse matrix mult order
* replace GetBoneLength/GetBoneDir with GetBoneBaseTRS
* fix GetBonePosition, remove GetBoneWorldMatrix as it's useless
* GetBonePosition
* deduplicate code
* rename GetBonePosition to GetBoneBasePosition to avoid confusion
* GetBoneBaseRotation
* GetBonePosition helper function
* forgot include_offsets
* split frame info calculation from RenderFrameModels
* clean up fvec4 being used as quat in iqms
* initial work on bone setting
* implement bone setters
* clean up FindModelFrame
* refactor model overrides into its own function
* refactor frame rendering into RenderModelFrame
* split frame processing into ProcessModelFrame
* refactor BoneOverride in preparation for translation/scale overrides
* clean up macros
* SetBoneTranslation/SetBoneScaling
* GetBoneOffset
* fix compilation on linux/mac (fuck you MSVC)
* fix typo 😅
* make sure bone overrides are cleared on model switches, add ClearBoneOffsets to clear them manually
* bone info getters
* fix joint lengths, add joint dirs
* serialize bone overrides
* fix bone dir return type
* GetBoneIndex/GetBoneCount
* helper functions for working with non-quat angles
* add mode enum, add more helper functions
* fix up formatting
* Feature-complete isometric mode fork.
* Dithered transparency condition tweaks.
* Dithered transparency for non-corpse monsters only (and missiles).
* SpectatorCamera vertical shift.
* Including math.h in hw_sprites.cpp to keep visual studio happy (it couldn't find M_SQRT2 definition).
* Defining MY_SQRT2 in hw_sprites.cpp to keep visual studio happy (it couldn't find M_SQRT2 definition).
* Defining MY_SQRT2 in r_utility.cpp also to keep visual studio happy.
* retrigger checks
* Have correct sprite angle-frame face the camera with orthographic projection enabled.
* Dithered Transparency now works properly on 3D floors. Moved that dither-trans flag setting code within hw_bsp.cpp to handle double-processing of linedefs. Added helper functions to FRenderViewpoint class 'bool IsOrtho()' and 'bool IsAllowedOoB()' to clean up checks everywhere in the code.
* Fixed indents. Added bbox property to subsector struct and use it instead of BSP nodes and Clippers (creating a bbox around viewpoint and checking for overlap) in orthographic mode when no fog of war is active. Turns out to be much faster. Though you need really big maps (Winter's Fury MAP01) to see a difference in fps.
* Non-linux checks don't like uint. Changed to unsigned int.
* Small change of a float to camera.zs. Ignore for testing. Should make no difference.
* Update actor.h to remain mergeable
RF2_NOMIPMAP was introduced, so I had to displace RF_ISOMETRICSPRITES to next bit.
The problem was that `time_to_dos` was putting the last modification
file date first and the time second. This was causing the date to be
interpreted as the time and vice versa when reading the Zip file.
See: https://github.com/ZDoom/gzdoom/issues/2306
