Fixes#6676.
Allow animated meshes to be cached in Irrlicht's builtin mesh cache.
Use Material.EmmissiveColor instead of manipulating the mesh' vertex colors.
- Increase ContentFeatures serialization version
- Color property and palettes for nodes
- paramtype2 = "color", "colored facedir" or "colored wallmounted"
This is a slightly modified and cleaned up version of #3774 by RealBadAngel.
By sofar: Remove color change (just make it lighter) and some minor cleanups.
- Don't create and cache an extruded mesh for every (non-node) item.
Instead use a single one per image resolution.
- For cubic nodes reuse a single wield mesh too
- Improve lighting of the wielded item
- Increase far value of wield mesh scene camera, fixes#1770
- Also includes some minor refactorings of Camera and GenericCAO.
TextureSource has a list of textures to delete (m_texture_trash) so this
provides a proper, non-hacky way to delete RTT textures. Also, the prior,
hacky way of deleting them seems to be broken (see pull request #803).
To avoid header file clutter by repeating the same long list of
arguments over and over again, store the arguments of
generateTextureFromMesh in a struct called TextureFromMeshParams.
Also fix issue #782 (Only use bilinear (and others) on item textures
when settings allow it).
