Drop Copy Add basic work. But support drop file only.
tree89540c78c0a217d84b1010cf51a510249e2e3251
-rw-r--r-- 372 .gitignore
-rw-r--r-- 391 .gitmodules
drwxr-xr-x - Languages
-rw-r--r-- 3557 build.txt
drwxr-xr-x - common
drwxr-xr-x - contrib
drwxr-xr-x - doc
drwxr-xr-x - ext
drwxr-xr-x - src