[wpilib] Rename GenericHID and Gamepad enums to all caps

GenericHID.getSupportedOutputs(): Return EnumSet
Gamepad: Add Button-taking accessors

wpilibc/src/main/python/semiwrap/GenericHID.yml

@@ -7,6 +7,7 @@ classes:
     enums:
       RumbleType:
       SupportedOutputs:
+        arithmetic: true
       HIDType:
     methods:
       GenericHID:
@@ -46,7 +47,6 @@ classes:
       GetButtonsAvailable:
       GetTouchpadFingerAvailable:
       GetTouchpadFinger:
-
 inline_code: |
   cls_GenericHID
     .def("__repr__", [](py::handle self) {