Add pressure sensitive tablet support

Hi!

So I know I, along with a lot of artists are super excited about the new tattoo system added with the Business & Hobbies expansion, but something that would take the experience to a whole other level would be pressure sensitivity support. Right now the engine is a little clunky and not exactly what I had imagined when I bought the expansion for this main purpose.

Having the ability to control your line width and opacity naturally with that precision only tablets can provide would allow for some extraordinary creations to come out of the game. Would LOVE to see this in the game!