Key customization is now available

I'm not pro in GML language so some keys don't work
ord ("1") "2" etc... so only 5 keys are available to change

move left, right, jump, reload, fire (basically mouse left, but you can shoot with keyboard)
https://steamcommunity.com/app/1376830/discussions/0/2963894618466973739/

it was kinda experimental to change whole codes just to make a fixable key to do
the mouse left function so it's partly not working for some part. because i don't wanna cause
more bugs just to make key customization

as I said i changed whole code so it might cause the bug
in which case, I will roll back in 24 hours

enjoy the game with new flexible key customization!