jb: touch debounce (#798)

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

## Description of change
Debouce option for touch input. Applies to all touch handlers (rawinput,
win8, win7) since it sits at the touch layer, and then consumed by jb
touch logic.

## Testing

src/spice2x/touch/touch.cpp

@@ -20,6 +20,7 @@
 #include "util/detour.h"
 #include "util/libutils.h"
 #include "util/logging.h"
+#include "util/time.h"
 #include "util/utils.h"
 
 #include "handler.h"
@@ -538,6 +539,7 @@ static LRESULT CALLBACK SpiceTouchWndProc(HWND hWnd, UINT msg, WPARAM wParam, LP
                         .x = GET_X_LPARAM(lParam),
                         .y = GET_Y_LPARAM(lParam),
                         .mouse = true,
+                        .down_ms = get_performance_milliseconds(),
                     };
                     TOUCH_POINTS.push_back(tp);
 
@@ -851,6 +853,9 @@ void touch_write_points(std::vector<TouchPoint> *touch_points) {
         // create new touch point when not found
         if (!found) {
 
+            // stamp the landing time so debounce can measure the contact's age
+            tp.down_ms = get_performance_milliseconds();
+
             // add touch point
             TOUCH_POINTS.push_back(tp);
 

src/spice2x/touch/touch.h

@@ -7,6 +7,7 @@ struct TouchPoint {
     DWORD id;
     LONG x, y;
     bool mouse;
+    double down_ms = 0.0; // performance-counter milliseconds when the contact first landed
 };
 enum TouchEventType {
     TOUCH_DOWN,

src/spice2x/touch/win7.cpp

@@ -11,6 +11,7 @@
 
 #include "util/libutils.h"
 #include "util/logging.h"
+#include "util/time.h"
 #include "rawinput/touch.h"
 
 // mingw issue #2205 workaround
@@ -177,6 +178,7 @@ void Win7Handler::handle_message(msg_handler_result &result, HWND hWnd, UINT msg
                             .x = point.x,
                             .y = point.y,
                             .mouse = false,
+                            .down_ms = get_performance_milliseconds(),
                         };
                         TOUCH_POINTS.push_back(tp);
 

src/spice2x/touch/win8.cpp

@@ -12,6 +12,7 @@
 
 #include "util/libutils.h"
 #include "util/logging.h"
+#include "util/time.h"
 #include "rawinput/touch.h"
 
 // mingw does not seem to have this either
@@ -220,6 +221,7 @@ void Win8Handler::handle_message(msg_handler_result &result, HWND hWnd, UINT msg
                         .x = point.x,
                         .y = point.y,
                         .mouse = false,
+                        .down_ms = get_performance_milliseconds(),
                     };
                     TOUCH_POINTS.push_back(tp);