rb: touch debug overlay, tweak scaling (#801)

## Link to GitHub Issue or related Pull Request, if one exists
n/a

## Description of change
Similar to #797, draw an overlay to debug touch issues for reflec beat.

For rb, we draw on the ImGui surface. Draw horizontal and vertical line
for triggered sensors, and also a bounding box if scaling is in use.

Make small tweaks to how scaling works.

## Testing
Verified volzza 2 / reflesia / 1st game (landscape KBR)

src/spice2x/launcher/launcher.cpp

@@ -49,6 +49,7 @@
 #include "games/popn/popn.h"
 #include "games/qma/qma.h"
 #include "games/rb/rb.h"
+#include "games/rb/touch_debug.h"
 #include "games/rf3d/rf3d.h"
 #include "games/sc/sc.h"
 #include "games/scotto/scotto.h"
@@ -1339,6 +1340,7 @@ int main_implementation(int argc, char *argv[]) {
     }
 
     // reflec beat touch emulation
+    games::rb::TOUCH_DEBUG_OVERLAY = options[launcher::Options::RBTouchDebug].value_bool();
     if (options[launcher::Options::spice2x_RBTouchScale].is_active()) {
         games::rb::TOUCH_SCALING = options[launcher::Options::spice2x_RBTouchScale].value_uint32();
     }

src/spice2x/launcher/options.cpp

@@ -2739,6 +2739,18 @@ static const std::vector<OptionDefinition> OPTION_DEFINITIONS = {
         .category = "Game Options",
         .quick_setting_category = "Game",
     },
+    {
+        // RBTouchDebug
+        .title = "RB Touch Debug Overlay",
+        .name = "rbtouchdebug",
+        .desc = "Draw lines to show IR sensor emulation state.\n\n"
+            "Note: lines will not perfectly align with touches; this is by design, it's showing the "
+            "IR sensor state, before the game applies its own touch detection algorithm.",
+        .type = OptionType::Bool,
+        .game_name = "Reflec Beat",
+        .category = "Game Options",
+        .quick_setting_category = "Game",
+    },
     {
         // spice2x_RBTouchScale
         .title = "RB Touch Emulation Scale",

src/spice2x/launcher/options.h

@@ -265,6 +265,7 @@ namespace launcher {
             JubeatTouchAlgo,
             JubeatTouchDebug,
             JubeatTouchDebounce,
+            RBTouchDebug,
             spice2x_RBTouchScale,
             RBTouchSize,
             RBTouchPollRate,