Replace WM_MOVE and WM_SIZE message handling with WM_POSCHANGED instead.
This is for multiple reasons:
1) Microsoft suggest using WM_POSCHANGED is more efficient
2) RectChanged callback is only called once for most window operations
3) Simplifies message handling code
[macOS] Fix transient windows not working in the full-screen mode.
[macOS] Fix moving transient windows to the other screen than parent window.
[macOS] Fix popup menu switch on hover.
[macOS] Use content origin rect for windows position (to ensure `DS.mouse_get_position` is equal to `DS.window_get_position` + mouse position from the input events).
[macOS] Fix incorrect input coordinates, when external display with different scaling in connected/disconnected.
[macOS/Windows] Fix moving fullscreen windows between the screens.
Add auto refocusing of the parent window, when the focused transient window is closed.
Remove redundant `DS.mouse_get_absolute_position` function (returns mouse position in the screen coordinates, same as `DS.mouse_get_position`).
Always build with the GUI subsystem.
Redirect stdout and stderr output to the parent process console.
Use CreateProcessW for blocking `execute` calls with piped stdout and stderr (prevent console windows for popping up when used with the GUI subsystem build, and have more consistent behavior with `create_process`).
Add `open_console` argument to the `execute` and `create_process` to open a new console window.
Remove `interface/editor/hide_console_window` editor setting.
Remove `Toggle System Console` menu option.
Remove `set_console_visible` and `is_console_visible` functions.
Building `target=release` and `target=release_debug` builds with MinGW-GCC
errors when linking with LTO.
Since it's only needed for `target=debug` builds anyway (bigger objects), which
we don't build with LTO, this works around the issue.
Equivalent `-Wa,-mbig-obj` for GCC/Clang.
This started being needed to compile harfbuzz in `target=debug` with MinGW/GCC,
but there doesn't seem to be any drawback to enabling `/bigobj` (aside from
losing support for pre-VS 2005 linkers, which we don't support).
