remove problematic default joy binds #88

The default keyboard/joystick bindings for the "special" keys have
assumptions about axis numbers that do not hold with modern game pads.

For reference, the 360 controller has the following mappings:

Axis 0/1: left stick
Axis 3/4: right stick
Axis 2:   left trigger
Axis 5:   right trigger

This triggers another bug causing the depressed state of a trigger axis
to fire continuously. In this case, this is the left trigger on a 360
controller which is axis 2.

This triggers yet another bug where a stream of joystick events blocks
keyboard events from registering, resulting in hotkeys like ctrl+p to
pause not working.

Replace all joystick binds for special keys with null values.

With this change, a default installation of vbam will not trigger the
hotkeys not working bug when a joystick is plugged in.

The other bugs here mentioned also need to be fixed.

src/wx/opts.cpp

@@ -133,9 +133,9 @@ wxJoyKeyBinding defkeys[NUM_KEYS * 2] = {
     { wxT('X') }, { 0, WXJB_BUTTON, 1 }, { wxT('Z') }, { 1, WXJB_BUTTON, 1 },
     { wxT('A') }, { 2, WXJB_BUTTON, 1 }, { wxT('S') }, { 3, WXJB_BUTTON, 1 },
     { WXK_BACK }, { 4, WXJB_BUTTON, 1 }, { WXK_RETURN }, { 5, WXJB_BUTTON, 1 },
-    { WXK_NUMPAD_UP }, { 2, WXJB_AXIS_PLUS, 1 }, { WXK_NUMPAD_DOWN }, { 2, WXJB_AXIS_MINUS, 1 },
-    { WXK_NUMPAD_LEFT }, { 3, WXJB_AXIS_MINUS, 1 }, { WXK_NUMPAD_RIGHT }, { 3, WXJB_AXIS_PLUS, 1 },
-    { WXK_NUMPAD_PAGEUP }, { 4, WXJB_AXIS_PLUS, 1 }, { WXK_NUMPAD_PAGEDOWN }, { 4, WXJB_AXIS_MINUS, 1 },
+    { WXK_NUMPAD_UP }, { 0 }, { WXK_NUMPAD_DOWN }, { 0 },
+    { WXK_NUMPAD_LEFT }, { 0 }, { WXK_NUMPAD_RIGHT }, { 0 },
+    { WXK_NUMPAD_PAGEUP }, { 0 }, { WXK_NUMPAD_PAGEDOWN }, { 0 },
     { wxT('W') }, { 0 }, { wxT('Q') }, { 0 },
     { WXK_SPACE }, { 0 }, { 0 }, { 0 },
     { 0 }, { 0 }