moved pthread code to CCPThreadWinRT
use CCPThreadWinRT
added missing CocoStudio files
Merge pull request #4261 from MSOpenTech/winrt-libextensions

[ci skip]Winrt libextensions fix
Merge pull request #4267 from nutty898/master_nutty_modify_layout

[ci skip]Master nutty modify layout
Modify relative layout
Merge branch 'master' into master_nutty_modify_layout