graphics: more window options for windowed subscreen (#308)

## Link to GitHub Issue, if one exists
Fixes #307 

## Description of change
Add an option for making TDJ/UFC subscreen window borderless in windowed
mode

Add another option for keeping the subscreen "always on top".

Add size / position arguments to SDVX windowed subscreen, exactly the
same as what is allowed for IIDX.

## Testing
Seems to work....

src/spice2x/launcher/options.h

@@ -207,6 +207,8 @@ namespace launcher {
             WindowForceScaling,
             spice2x_IIDXWindowedSubscreenSize,
             spice2x_IIDXWindowedSubscreenPosition,
+            IIDXWindowedSubscreenBorderless,
+            IIDXWindowedSubscreenAlwaysOnTop,
             spice2x_JubeatLegacyTouch,
             spice2x_RBTouchScale,
             spice2x_AsioForceUnload,
@@ -231,6 +233,10 @@ namespace launcher {
             MidiNoteSustain,
             NostalgiaPoke,
             ForceBackBufferCount,
+            SDVXWindowedSubscreenSize,
+            SDVXWindowedSubscreenPosition,
+            SDVXWindowedSubscreenBorderless,
+            SDVXWindowedSubscreenAlwaysOnTop,
         };
 
         enum class OptionsCategory {