control raspberry pi remotely by sending shell expressions to the bot.
output will be sent back.
control the timeout before processes are killed, and limit the amount printed.
'$ expression' to run stuff
'!t number' to adjust timeout
'!m number' to adjust number of printed characters
'!getfile path' uploads requested file to discord
'!sendfiles (optional path)' requires files attached to message. Sends files to bot and downloads them to 'pwd' or path from argument
'!newjob $ expression' creates a new job to run in background
'!listjobs' list the history of jobs.
'!killjob jobfilepath' kills job identified by 'path' from '!listjobs'