container: add mat3 and mat4 accessors, and ref getters for all
container: add mat3 and mat4 accessors, and ref getters for all

zenmumbler/stardazed-tx,stardazed/stardazed,zenmumbler/libzm,stardazed/stardazed-tx,zenmumbler/stardazed-tx,zenmumbler/libzm,zenmumbler/libzm,zenmumbler/libzm,stardazed/stardazed-tx,zenmumbler/stardazed-tx,zenmumbler/stardazed-tx,stardazed/stardazed-tx,stardazed/stardazed