fixed one-hang-bug in cocos-console-test.py
removed obsolete headers
updated missing files
added missing Assets folder
added missing Assets folder
removed obsolete include files
comment out warning code in quaternion.cpp
unify ZERO, ONE, UNIT_X/Y/Z/W into a consistent convention
Merge branch 'v3' into v3.1_unify_ZERO_ONE
Merge pull request #6586 from dabingnn/v3_unify_ZERO_ONE

V3 unify zero one
Merge pull request #6577 from MSOpenTech/v3-wp8-fix

V3 wp8 fix
[hot fixed]closed issue#4999:fixed label is unsharp if it's created by smaller font.
fixed indent
Merge pull request #6553 from Dhilan007/v3_labelhotfixed

[hot fixed]closed issue#4999:fixed label is unsharp if it's created by smaller font.
[ci skip]
[ci skip]
[ci skip]
Merge pull request #6559 from shujunqiao/cocos-console-hang

fixed one-hang-bug in cocos-console-test.py. [ci skip]
Re-adds download-deps.py, comments unzip functionality, please help to
test the download functionality. Thanks.