Fix Library Overrides and Negative Animation Frames

This update fixes issues related to library overrides and negative animation frames.

Fix export lock not initialized error

This update fixes the AttributeError: 'SOURCEOPS_OT_ExportAuto' object has no attribute '_lock' error that happens sometimes.

Fix SMD export in Blender 4.2

This update adds $renamematerial and particle attachments.
I never got around to testing these so I hope they work lol.
Also I fixed export in Blender 4.2 (they changed triangulate modifier).

Fix SMD export in Blender 4.1

This update fixes SMD export and the weighted normal button in Blender 4.1.

Quality of life features

This update adds several quality of life features:

• Support for HLMV++
• No longer possible to select non-armatures in the armature field
• No longer possible to select the same collection multiple times for the same model
• Force static when the model has no armature

Compile Multiple Models on Multiple Threads

This version makes it so compiling multiple models uses multithreading for StudioMDL, and tells you how long auto export took.

Disable Origin When Static Prop Combine is Enabled

Nice.
This version makes it so $origin is not used when static prop combine is enabled.

Align to Grid Fixes

This version fixes issues with the Align to Grid option for VMF export.
Coordinates are now rounded to the nearest integer, instead of always towards zero.
Align to Grid no longer affects displacements or their brushes.

Brush UV Export

This version adds @CryptAlchemy's brush UV feature to the map exporter.

Allow Static Props to use Bodygroups

I was confident this wasn't supported, but people are telling me otherwise, so I guess it's allowed again now.