new miners

hi!

as promised, here's the next micro functionality: adding miners

i created+coded the new popup that opens when you click the mainframe, plus coded the miner spawning

in the gif below, you can see me clicking in the miner button on the popup, then configuring the new miner to a different resource

you know it's not yet art, right? it's dev art, so i can prototype fast

and as you can see below, with too many miners, come too many pathing issues:

this fix can be postponed, i want now to refactor some code

i found an easier way to detect clicking on the robots and i'm prioritizing refactoring every single time

it keeps the code always clean and easy to understand

also well commented, thanks, that's important