gitadora: digital wailing sensitivity (#516)

## Link to GitHub Issue, if one exists
#512 

## Description of change
Add an option to adjust the hold period for digital wailing.

src/spice2x/launcher/options.cpp

@@ -998,6 +998,19 @@ static const std::vector<OptionDefinition> OPTION_DEFINITIONS = {
             {"both", "both lefty"},
         },
     },
+    {
+        // GitaDoraWailHold
+        .title = "GitaDora Digital Wail Hold",
+        .name = "gdwailhold",
+        .desc = "For digital wail input, how long (in milliseconds) to hold the wail state. Practically, this controls "
+            "how sensitive wailing is.\n\n"
+            "Default: 100 (ms)\n\n"
+            "If set to 0, no hold will occur, which means you need to press the wail button longer to register; "
+            "default value of 100ms will cause the game to trigger wail even on a light tap of the button",
+        .type = OptionType::Integer,
+        .game_name = "GitaDora",
+        .category = "Game Options",
+    },
     {
         .title = "Force Load Jubeat Module",
         .name = "jb",