Merge pull request #9101 from super626/v3

Add uv animation test
externals: using v21
Merge pull request #9126 from ricardoquesada/v21_externals

externals: using v21
ooops

commited by mistake debug messages
Using std::swap instead of CC_SWAP

CC_SWAP is deprecated. Use `std::swap` instead.
Merge pull request #9134 from ricardoquesada/std_swap

Using std::swap instead of CC_SWAP