gitadora: various fixes for wailing (#513)

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

## Description of change
Fix digital wailing not being recognized consistently.

Also address the fact that wailing was completely broken when lefty mode
was on. This requires a new option that the user needs to check off in
the configurator since we can't magically guess if the user is holding
the guitar in lefty mode.

- [x] fix downward wail
- [x] digital lefty mode
- [x] implement all of this for arena model i/o
- [x] test dx cab 2p
- [x] lefty toggle in overlay
- [x] fix analog not working for 2p guitar
- [ ] analog lefty mode?

## Testing
Checked GW and GW Delta

src/spice2x/games/io.cpp

@@ -47,6 +47,7 @@ namespace games {
     static robin_hood::unordered_map<std::string, std::vector<Button>> buttons_keypads;
     static robin_hood::unordered_map<std::string, std::vector<Button>> buttons_overlay;
     static robin_hood::unordered_map<std::string, std::string> buttons_help;
+    static robin_hood::unordered_map<std::string, std::string> analogs_help;
     static robin_hood::unordered_map<std::string, std::vector<Analog> &> analogs;
     static robin_hood::unordered_map<std::string, std::vector<Light> &> lights;
     static robin_hood::unordered_map<std::string, std::vector<Option>> options;
@@ -107,6 +108,7 @@ namespace games {
         games.push_back(gitadora);
         buttons.insert({ gitadora, gitadora::get_buttons() });
         buttons_help.insert({ gitadora, gitadora::get_buttons_help() });
+        analogs_help.insert({ gitadora, gitadora::get_analogs_help() });
         analogs.insert({ gitadora, gitadora::get_analogs() });
         lights.insert({ gitadora, gitadora::get_lights() });
         file_hints[gitadora].emplace_back("gdxg.dll");
@@ -349,6 +351,15 @@ namespace games {
         return it->second;
     }
 
+    std::string get_analogs_help(const std::string &game) {
+        initialize();
+        auto it = analogs_help.find(game);
+        if (it == analogs_help.end()) {
+            return "";
+        }
+        return it->second;
+    }
+
     static std::vector<Button> gen_buttons_keypads(const std::string &game) {
         auto buttons = GameAPI::Buttons::getButtons(game);
         std::vector<std::string> names;