added warnings to canvas toolbox
added warnings to canvas toolbox

PHironaka/make8bitart,haustraliaer/make8bitart,PHironaka/make8bitart,jstarks/make8bitart,jennschiffer/make8bitart,make8bitart/make8bitart,vladikoff/make8bitart,jennschiffer/make8bitart,make8bitart/make8bitart,haustraliaer/make8bitart,jstarks/make8bitart