OpenBVE v1.11.2.3

Significant Changes:

• Fix: Several edge-cases in the new block parser.
• Fix: Permille gradient display incorrect.
• Fix: TrackFollowerFunction with no axles set failed to work correctly.
• Fix: An object using an invalid (non-zero) state as hidden could be incorrectly shown on introduction.
• Change: Pre-load all variants of a texture, not just ClampClamp if preloading is selected.
• Change: Improve vertex de-duplication algorithm for a considerable speedup.
• Change: Update openal-soft to v1.24.3
• Change: Update OpenGL related error strings to reflect minumum GL4.3 in new renderer.