Use modern DPI awareness settings (#13254)
Fixes #13370
Fixes #6722
Fixes #3875
Fixes #12070
Fixes #7083
Fixes #7915
Likely fixes #9531, otherwise close as stale/can't reproduce
### Summary of the issue:
When DPI for a monitor is not set to 100%, or when using multiple monitors with different DPI settings,
NVDA would:
- misplace highlight frames
- have inaccurate mouse tracking
- have inaccurate touch screen interaction
NVDA currently sets the DPI awareness via a Windows API call introduced in Windows Vista.
It is recommended to set DPI through the app manifest, rather than Windows API calls where possible.
Newer settings for DPI awareness have been introduced since Windows Vista.
Windows 8 introduced multiple monitor DPI awareness.
Windows 10 introduced a richer version of multiple monitor DPI awareness.
### Description of how this pull request fixes the issue:
Background docs: https://docs.microsoft.com/en-us/windows/win32/hidpi/high-dpi-desktop-application-development-on-windows#per-monitor-and-per-monitor-v2-dpi-awareness
When running as an executable, NVDA sets DPI awareness via the app manifest.
When running through source, NVDA sets DPI awareness via Windows API calls.
The most modern method available is used to set DPI awareness.
- For Windows 7, DPI awareness is unlikely to improve. There may be fixes from setting it via the app manifest instead of via Windows API calls.
- For Windows 8 and newer, NVDA has per monitor DPI awareness
- For Windows 10 1703 and newer, NVDA has [advanced per monitor DPI awareness](https://docs.microsoft.com/en-us/windows/win32/hidpi/dpi-awareness-context), including:
- Child window DPI change notifications
- Scaling of non-client area - All windows will automatically have their non-client area drawn in a DPI sensitive fashion. Calls to [EnableNonClientDpiScaling](https://docs.microsoft.com/en-us/windows/desktop/api/Winuser/nf-winuser-enablenonclientdpiscaling) are unnecessary.
- Scaling of Win32 menus - All NTUSER menus created in Per Monitor v2 contexts will be scaling in a per-monitor fashion.
- Dialog Scaling - Win32 dialogs created in Per Monitor v2 contexts will automatically respond to DPI changes.
- Improved scaling of comctl32 controls - Various comctl32 controls have improved DPI scaling behavior in Per Monitor v2 contexts.
- Improved theming behavior - UxTheme handles opened in the context of a Per Monitor v2 window will operate in terms of the DPI associated with that window.
