add kint
enable kint and memoize LoadDB
remove d()
Merge pull request #285 from will123195/2.2

2.2
remove kint submodule
remove kint
add kint
Merge pull request #286 from will123195/2.2

don't use submodule for kint
disable model memoization
Merge pull request #287 from will123195/2.2

disable model memoization