Rename the `bPoseChannel::flag` `PCHAN_HAS_TARGET` to `PCHAN_HAS_NO_TARGET`
as that is actually the meaning of the flag (in the majority of the code).
Since the flag was so confusingly named, there were some mixups in the
armature overlay drawing code as well, which have been fixed now too.
Using ClangBuildAnalyzer on the whole Blender build, it was pointing
out that BLI_math.h is the heaviest "header hub" (i.e. non tiny file
that is included a lot).
However, there's very little (actually zero) source files in Blender
that need "all the math" (base, colors, vectors, matrices,
quaternions, intersection, interpolation, statistics, solvers and
time). A common use case is source files needing just vectors, or
just vectors & matrices, or just colors etc. Actually, 181 files
were including the whole math thing without needing it at all.
This change removes BLI_math.h completely, and instead in all the
places that need it, includes BLI_math_vector.h or BLI_math_color.h
and so on.
Change from that:
- BLI_math_color.h was included 1399 times -> now 408 (took 114.0sec
to parse -> now 36.3sec)
- BLI_simd.h 1403 -> 418 (109.7sec -> 34.9sec).
Full rebuild of Blender (Apple M1, Xcode, RelWithDebInfo) is not
affected much (342sec -> 334sec). Most of benefit would be when
someone's changing BLI_simd.h or BLI_math_color.h or similar files,
that now there's 3x fewer files result in a recompile.
Pull Request #110944
The `TD_NOTCONNECTED` flag is not set in all cases.
In some cases, such as Meshes, the `FLT_MAX` value better determines
when the `TrasData` is not "connected".
Therefore, this commit removes the `TD_NOTCONNECTED` flag and adapts
the code to rely on the `FLT_MAX` value instead.
These TrasDatas shouldn't even be created in these cases.
