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/overlay/windows/iopanel.cpp

@@ -3,6 +3,7 @@
 #include "launcher/launcher.h"
 #include "games/io.h"
 #include "misc/eamuse.h"
+#include "overlay/imgui/extensions.h"
 
 namespace overlay::windows {
 
@@ -80,6 +81,9 @@ namespace overlay::windows {
         {
             ImGui::SetCursorPosY(ImGui::GetCursorPosY() - ImGui::GetFrameHeightWithSpacing());
             this->build_button("+", tall, this->test_button, this->service_button);
+            if (ImGui::IsItemHovered()) {
+                ImGui::HelpTooltip("SERVICE + TEST");
+            }
         }
         ImGui::EndGroup();