* Fix#15937 - Fix debuggee hanging when attaching to it
* Fix `dm` not working for attached processes
* Fix debuggee crashing when opening a file dialog
* Unify RIOW32Dbg and w32dbg_wrap_instance under W32DbgWInst
* Don't signal threads on select, only on continue
The user was interrupted during continue and switched to a different
thread since DebugBreakProcess creates a thread that triggers a breakpoint.
With these changes the DebugBreak thread is recorded to skip the breakpoint
event afterwards.