[Performance Optimizations] Misc Performance and CPU Optimizations

[thr3343]

Some minor performance-related patches that should help performance in game slightly
(e.g. Chunk rendering is about 5-10% faster)

• Use faster renderpass transitions
• Remove duplicated cmdBuffer constructor in CommandPool.class
• Reduce Chunk rendering CPU Overhead slightly
• Minimize native calls to waitFences via aggregated waits
• Optimize + use more precise Sampler Stage flags
• Reduce number of terrain pipelines generated
• Remove Terrain AlphaCutout uniform + hardcode to 0.5f
• Remove some unused/outdated terrain shaders/pipelines
• Some misc spec fixes

[thr3343]

Decided to close this PR temporarily, as it will cause merge conflicts with a separate PR i'm working on (Bindless rendering)

That PR also has alot of the same optimizations this one has, so this PR is a bit redundant

So will likely reopen this again in the future without the merge conflicts + some new optimisations