Add love.window.getSafeArea (resolves issue #1437). Returns a rectangle (x, y, w, h) inside the window which is known to be unobstructed by a system title bar, the iPhone X notch, etc. Useful for making sure UI elements can be seen by the user.

Currently it only has a proper implementation on iOS and will return the window's full size otherwise.

src/modules/window/Window.h

@@ -24,6 +24,7 @@
 // LOVE
 #include "common/Module.h"
 #include "common/StringMap.h"
+#include "common/math.h"
 #include "image/ImageData.h"
 
 // C++
@@ -151,6 +152,8 @@ public:
 	virtual void setPosition(int x, int y, int displayindex) = 0;
 	virtual void getPosition(int &x, int &y, int &displayindex) = 0;
 
+	virtual Rect getSafeArea() const = 0;
+
 	virtual bool isOpen() const = 0;
 
 	virtual void setWindowTitle(const std::string &title) = 0;