[NTUSER] Remove RETURN() macro (#6194) Remove macro definition and the remaining uses. RETURN() macro is just a wrapper for goto, most of the time it makes the code more complicated than using goto directly.
[WIN32SS] Fix CF_DIB format not being saved to clipboard on Print Screen key (#3265) Use pool to allocate (potentially huge) clipboard data buffers. CORE-17318
[NTUSER] Fix UserDestroyInputContext (again) (#4476) Fix the HIMC handle leak. CORE-11700
[NTUSER] Do assignment lock pti->spDefaultImc (#4456) According to JIRA user simonelombardo, there was crash in exiting a thread. - Add UserAssignmentLock, and UserAssignmentUnlock helper functions. - Lock and unlock pti->spDefaultImc by using those helper functions. CORE-18044
[WIN32SS][NTUSER] Implement NtUserDestroyInputContext (#4063) CORE-11700
[WIN32K] Fix 64 bit issues (#420) - Fix ULONG/SIZE_T issues - Use LOWORD/HIWORD - Change a struct member to HANDLE - Implement lstrlenW helper function
Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers into modules, and delete rossubsys.