MeshUpdateQueue: Add a MapBlock cache that minimizes the amount of MapBlock copying done in the main thread

Cache size is configurable by the meshgen_block_cache_size (default 20 MB).

New profiler stats:
- MeshUpdateQueue MapBlock cache hit %
- MeshUpdateQueue MapBlock cache size kB

Removes one type of stutter that was seen on the client when received MapBlocks
were being handled. (the "MeshMakeData::fill" stutter)

Kind of related to at least #5239

Originally preceded by these commits, now includes them:
- Move the mesh generator thread into src/mesh_generator_thread.{cpp,h}
- mesh_generator_thread.cpp: Update code style
- MeshUpdateThread: Modify interface to house a different implementation: Actual functionality will be changed by next commits.
- MeshMakeData: Add fillBlockData() interface (so that caller can fill in stuff from eg. a MapBlock cache)

build/android/jni/Android.mk

@@ -185,6 +185,7 @@ LOCAL_SRC_FILES := \
 		jni/src/mapnode.cpp                       \
 		jni/src/mapsector.cpp                     \
 		jni/src/mesh.cpp                          \
+		jni/src/mesh_generator_thread.cpp         \
 		jni/src/metadata.cpp                      \
 		jni/src/mg_biome.cpp                      \
 		jni/src/mg_decoration.cpp                 \