improve Prompt and use it to ask for level and file name when exporting

code/keybind.lua

@@ -44,6 +44,7 @@ function Keybind:CheckDown(action)
 	end
 end
 
+-- relies on being called exactly once per frame to be accurate.
 function Keybind:CheckPressed(action)
 	if Keybind:CheckDown(action) then
 		if not action.pressed then
@@ -77,6 +78,7 @@ function Keybind:RemoveKeys(action)
 	action.keys = {}
 end
 
+-- this prolly should be used by Prompt:keypressed()
 function Keybind:hasKey(action, key)
 	for _, v in pairs(action.keys) do
 		if v == key then