* Turn `_PARTICLELAYER_ON` back to a multi_compile keyword to fix snow coverings. * Reject renderers with property blocks that set `_ParticleLayer` from instancing. * Keep renderers non-instanced when `indirect_instancing.fallback` is disabled. * Store reasons for reject/fallback and display it in the debug overlay. * Do not spam the console about fallback instances. * Rename ConVars monsters/non_monsters to multi_draw/single_draw for consistency. * Guard dangerous Indirect Instancing ConVars behind ClientAdmin. * Display the current biome when running `terrain.debug`.