Massively improved Config Key/Joy Mappings screen.

Warning is dismissable now, and cursor does not start in a position that will change a setting.
New special actions added:  ClearToDefault, ReloadFromDisk, SaveToDisk, SetListMode.  Exit is a special action.
Player is prompted to save when exiting screen instead of saving after every action.
Special actions fallback on Graphics/SMC action if they don't have their own.
Moved SMC overlay to Graphics/SMC warning.
Metrics for configuring input lock time, warning autodismiss time, lines visible, and NoSetListPrompt autodismiss time.
Header row added for cursor to start on.
ScreenMapControllers2 deleted as obsolete.
BitmapText:maxwidth changed to factor the zoom of the actor into the calculation.

Themes/_fallback/Graphics/ScreenMapControllers action.lua

@@ -0,0 +1,16 @@
+return LoadFont("Common Normal") .. {
+	InitCommand= cmd(x, SCREEN_CENTER_X; zoom, .75; shadowlength, 0; diffuse, color("#808080")),
+	OnCommand= function(self)
+		self:diffusealpha(0)
+		self:decelerate(0.5)
+		self:diffusealpha(1)
+		-- fancy effect:  Look at the name (which is set by the screen) to set text
+		self:settext(
+			THEME:GetString("ScreenMapControllers", "Action" .. self:GetName()))
+	end,
+	OffCommand=cmd(stoptweening;accelerate,0.3;diffusealpha,0;queuecommand,"Hide");
+	HideCommand=cmd(visible,false);
+
+	GainFocusCommand=cmd(diffuseshift;effectcolor2,color("#808080");effectcolor1,color("#FFFFFF"));
+	LoseFocusCommand=cmd(stopeffect);
+};