v2.0.19

• Bugfix - GUI - "Off-Screen Locations" - Update state when changing app page.
• Bugfix - Only consider 'attached' apps when looking for 'open' ones (caused some broken toggles just after WTQ start).
• Feature - GUI - Debug info.
• Feature - Removed in-app log sink (too complicated and resource-intensive).
• Feature - Single-instance mode - Only allow a single instance of WTQ to run (i.e. stop when another instance is already running).
• Maintenance - .Net 10.
• Maintenance - Removed 'Win32v1', replaced by 'Win32v2'.