Rework window condition

Layout changes to make controlling the checkboxes less confusing.

Added variable support for the winddow title selection.

Previously window title matching was mandatory, which is now optional.
This would make it difficult to set up condition which are independent
of the window title. For example, a condition wich triggers on focus
window change.

Add support for configuring the regex options used for the window title
options.

Also adds the option to check the content displayed in a given window
using the Windows API as an alternative to the OCR of the video
condition.

src/linux/advanced-scene-switcher-nix.cpp

@@ -332,6 +332,12 @@ bool IsFullscreen(const std::string &title)
 	return windowStatesAreSet(title, states);
 }
 
+std::optional<std::string> GetTextInWindow(const std::string &window)
+{
+	// Not implemented
+	return {};
+}
+
 #ifdef USE_PROCPS
 void GetProcessList(QStringList &processes)
 {