bb-cli: Use minimist for arg parsing

[aidant19]

Currently the Blockbench CLI plugin relies on a less than optimal strategy for parsing the arguments that it receives. minimist should likely be used, as is already used elsewhere for this purpose. This will need to be imported somehow.

Reference: #64 (comment)

[TheAfroOfDoom]

i think this would need something like webpack in order to work. tbh a lot more work than is worth doing

edit: or babel?