This reverts commit 6207708607.
It broke a GDScript test (which didn't exist back when the PR was made,
so was missed prior to the merge).
It choked on:
```
prints("a", test_instance.a, test_instance.a == Named.VALUE_A)
```
With:
```
Invalid operands "VALUE_A (enum value)" and "int" for "==" operator.
```
- More accurate sliding in slopes to keep input direction correct
- More accurate constant speed calculation
- Renamed linear_velocity to motion_velocity for clarity
- General code cleaning and simplifications
Stop include Bullet headers using `-isystem` for GCC/Clang as it misleads
SCons into not properly rebuilding all files when headers change.
This means we also need to make sure Bullet builds without warning, and
current version fares fairly well, there were just a couple to fix (patch
included).
Increase minimum version for distro packages to 2.90 (this was never released
as the "next" version after 2.89 was 3.05... but that covers it too).
Fixes#43868.
(cherry picked from commit b7901c773c)
_update_kinematic_motion() shouldn't be called in the constructor
It's too early and causes a first call to set the body position to 0.
Then the second call to set the actual position triggers kinematic
motion, colliding with objects on the path to the initial position.
Side effect of sync to physics now enabled by default.
Fixes some issues found by UBSAN and other misc things:
* Fixed memory leak on exit.
* Properly align ray packet buffer to 64 bytes.
* Added some compiler flags from Embree's build system.
* Fixed ray masks.
Create GLTFSkeleton at the same time we create GLTFNode objects.
Create GLTFSkin at the same time we export MeshInstance3D
Fixes export of blend shape arrays for meshes with multiple surfaces.
Fixes array indexing issues in export of glTF morph target animations.
Converts BoneAttachment3D nodes during normal node creation: this avoids
special cases during mesh export, and especially exporting skeletons or meshes
which are children of BoneAttachment3D.
Co-authored-by: K. S. Ernest (iFire) Lee <ernest.lee@chibifire.com>
