[macos, ios]: Refactor joypad support into shared code, numerous bugfixes

drivers/SCsub

@@ -26,7 +26,9 @@ if env["xaudio2"]:
         print_error("Target platform '{}' does not support the XAudio2 audio driver".format(env["platform"]))
         Exit(255)
     SConscript("xaudio2/SCsub")
-
+# Shared Apple platform drivers
+if env["platform"] in ["macos", "ios"]:
+    SConscript("apple/SCsub")
 # Midi drivers
 SConscript("alsamidi/SCsub")
 SConscript("coremidi/SCsub")