jb: option to draw debug graphics to show touch interactions (#797)

## Link to GitHub Issue or related Pull Request, if one exists
related to #697 

## Description of change
Add a new option that paints touch targets and touch points for jubeat;
gets enabled if there is a touch screen connected. This is to help
explain / debug issues when users have their touch screen issues, which
is usually due to misalignment.

Fix the touch targets being off by 1 pixel (center gap is 1px wider in
both directions).

Also, simplify the `improved` algorithm to simulate a finger and trigger
nearest-neighbor for the AC dimensions. In terms of touch performance
this is near identical to what we had before, but it allows us to draw a
nice debug overlay instead of just grids.

## Testing
Tested portrait and landscape versions of jb.

src/spice2x/launcher/options.cpp

@@ -2691,6 +2691,7 @@ static const std::vector<OptionDefinition> OPTION_DEFINITIONS = {
         .desc = "For touch screen players: choose the touch algorithm to use.\n\n"
             "legacy - evenly divide the grid into 16 squares; old spicetools behavior, slightly inaccurate in gaps\n\n"
             "improved (default) - squares register as-is, gaps will trigger the closest square\n\n"
+            "plus - like improved, but gaps can trigger multiple buttons (like the mobile game)\n\n"
             "accurate - only touches within squares will trigger; gaps do nothing (for AC size touch screens)",
         .type = OptionType::Enum,
         .game_name = "Jubeat",
@@ -2698,10 +2699,32 @@ static const std::vector<OptionDefinition> OPTION_DEFINITIONS = {
         .elements = {
             {"legacy", ""},
             {"improved", ""},
+            {"plus", ""},
             {"accurate", ""},
         },
         .quick_setting_category = "Game",
     },
+    {
+        // JubeatTouchDebug
+        .title = "JB Touch Debug Overlay",
+        .name = "jubeattouchdebug",
+        .desc = "For touch screen players: draw a debug overlay on the main display. "
+            "Requires the Spice Overlay to be enabled.\n\n"
+            "auto (default) - show boundary boxes when a touch screen is detected; otherwise, none\n\n"
+            "none - draw nothing\n\n"
+            "box - show the 4x4 touch boundary boxes\n\n"
+            "all - show both the boxes and the touch circles",
+        .type = OptionType::Enum,
+        .game_name = "Jubeat",
+        .category = "Game Options",
+        .elements = {
+            {"auto", ""},
+            {"none", ""},
+            {"box", ""},
+            {"all", ""},
+        },
+        .quick_setting_category = "Game",
+    },
     {
         // spice2x_RBTouchScale
         .title = "RB Touch Emulation Scale",