Upgrade Raylib to 6.0 (#337)

* Updated target to Raylib 6 + synced invoke called with the changes in C. [WARNING: Breaking changes!]

* Added severial examples. Corrected towards the correct return type and add utilities to prevent working with pointers

* Additional resources from the Raylib repo.

* Fixed additional pinvokes to match with the new raylib bindings. [Warning breaking changes!]

* Fixing the QOL utils

* Fixing the Mesh struct

* Applying changes after review. Merged resources.LICENSE + raylib-cs.Native.csproj only targets dotnet8

* Updated README to reflect .NET 10 and Raylib 6 compatibility changes.

* Updated shader colors, adjusted car model scale, disabled HDR in SkyboxDemo, and fixed camera mode assignment. Removed unused `Capacity` field in FilePathList struct.

* Improved XML comments for consistency, fixed spacing and formatting across examples, added new resources to `resources.LICENSE`.

* Updated XML comment for `GetDirectoryFileCountEx` to clarify behavior and filtering options.

* Updated and clarified XML comments for methods and parameters, improved naming consistency, and refined shader-related functions. Renamed enums in `Shader.cs` for so it is inline with the upstream.

* Improved XML comments for clarity and consistency in `Model.cs` and `Mesh.cs`, updated method and variable names for better readability, and adjusted logic in span creation methods.

* Corrected XML comment capitalization in `Model.cs`.

---------

Co-authored-by: Meatcorps <info@meatcorps.nl>

Examples/resources/models/gltf/LICENSE

@@ -1,5 +0,0 @@
-robot.glb model by @Quaternius (https://www.patreon.com/quaternius)
-Licensed under CC0 1.0 Universal (CC0 1.0) - Public Domain Dedication (https://creativecommons.org/publicdomain/zero/1.0/)
-
-greenman.glb, greenman_hat.glb, greenman_sword.glb, greenman_shield.glb models by @iP (https://github.com/ipzaur)
-Licensed under CC0 1.0 Universal (CC0 1.0) - Public Domain Dedication (https://creativecommons.org/publicdomain/zero/1.0/)

Examples/resources/models/obj/character.mtl

@@ -0,0 +1,12 @@
+# Blender MTL File: 'None'
+# Material Count: 1
+
+newmtl skin
+Ns 86.470579
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 0.000000
+illum 9

Examples/resources/models/vox/LICENSE

@@ -1,9 +0,0 @@
-The following models are provided by the official github repo of voxel-model format by MagikaVoxel developer @ephtracy
-
-GitHub official repo: https://github.com/ephtracy/voxel-model
-
- - chr_knight.vox - https://github.com/ephtracy/voxel-model/blob/master/vox/character/chr_knight.vox
- - chr_sword.vox - https://github.com/ephtracy/voxel-model/blob/master/vox/character/chr_sword.vox
- - monu9.vox - https://github.com/ephtracy/voxel-model/blob/master/vox/monument/monu9.vox
- 
-Worth mentioning there is no license specified for the models yet: https://github.com/ephtracy/voxel-model/issues/22