rename some things to be more pico8ish
`warning` -> `warn`
`setfps` -> `fps`
`_keyup` -> `keyr`
`_keydown` -> `keyp`
`_textinput` -> `keyc`
`_touchup` -> `touchr`
`_touchdown` -> `touchp` 
`_getcursorx` -> `curx`
`_getcursory` -> `cury`
`_getpicoloveversion` -> `ver`
