* added cel-shading and outline using inverted hull example

* new screenshot

* added glsl100+120 compat

* updated view

* unnecessary spacing

REVIEWED: Reorganized structures for a clearer distinction between "skeleton", "skin" and "skinning" data
ADDED: New structures: `ModelSkeleton`, `ModelAnimPose` (alias `Transform*`)
ADDED: Runtime data `currentPose` and `boneMatrices` to `Model` structure
ADDED: Support animation frames-blending, for timing control
ADDED: Support animations blending, between two animations
REVIEWED: All models animation loading functions
ADDED: `UpdateModelAnimationEx()` for two animations blending
REMOVED: `UpdateModelAnimationBones*()`, simplified API
REVIEWED: Shader attributes/uniforms names for animations, for consistency
REVIEWED: Multiple tweaks on animations loading for consistency between formats
ADDED: example: `models_animation_timing`
ADDED: example: `models_animation_blending`
REVIEWED: example: `models_animation_gpu_skinning`
REVIEWED: example: `models_animation_blend_custom`
REVIEWED: All animated models loading examples

* [rmodels] Added implementation of `UpdateModelAnimationBonesWithBlending()` function

Signed-off-by: Kirandeep-Singh-Khehra <kirandeepsinghkhehra@gmail.com>

* [rmodels] Added example for animation blending and fixed wrap issue for blend factor

Signed-off-by: Kirandeep-Singh-Khehra <kirandeepsinghkhehra@gmail.com>

* [rmodels] Updated build information for animation blending example

Signed-off-by: Kirandeep-Singh-Khehra <kirandeepsinghkhehra@gmail.com>

* [rmodels] Fixed typos in anmation blending example

Signed-off-by: Kirandeep-Singh-Khehra <kirandeepsinghkhehra@gmail.com>

* [rmodels] Updated blend function signature and added function to update verts from bones

Signed-off-by: Kirandeep-Singh-Khehra <kirandeepsinghkhehra@gmail.com>

* [rmodels] Updated documentation

Signed-off-by: Kirandeep-Singh-Khehra <kirandeepsinghkhehra@gmail.com>

* rlparser: update raylib_api.* by CI

* rlparser: update raylib_api.* by CI

---------

Signed-off-by: Kirandeep-Singh-Khehra <kirandeepsinghkhehra@gmail.com>
Co-authored-by: Ray <raysan5@gmail.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

- Demonstrates per-bone animation blending for smooth transitions
- Supports upper/lower body selective blending (walk + attack)
- Includes uniform blending mode for comparison
- Uses GPU skinning for performance
- Follows raylib example conventions