fadeout tutorial tips in key teachable moments

[KrabCode]

like when you hide the gui - show that you can unhide it with 'H' on screen for a few seconds and then fade away.

contrasty background behind the text to ensure readability.

[KrabCode]

use this to tell the user they can change precision on a slider with the scroll wheel when they try to move it in really tiny increments in the default config (and no precision was changed in the sketch at this runtime)

[KrabCode]

have a constructor and 'options' option to disable these tooltips but otherwise show them either every time the action is taken or only once per sketch and persist using saves somehow