Add Makefiles with convenience functions to each indicator

[chinandrew]

Summary of changes:
Adds identical makefiles (except the utils, which only installs the utils) to each directory with a few convenience commands

Commands:

• make install: pip installs the utils package and the indicator in editable mode in the venv, which means any changes you make to the utils package or your indicator will automatically propagate without having to reinstall
• make test: runs pytest on the entire test directory
• make lint: runs pylint on the code directory (through janky regex to accommodate dynamic folder names)
• make venv: creates a virtual environment called env. install calls this so you probably don't need to use it.
• make clean: deletes the virtual environment and params.json

NOTE: When you run the commands, they will all be run in your virtual environment but your shell itself won't be activated (i.e. it won't show (env) in front) because make commands run in their own shell that exits once the command completes. However, all the installations, tests, etc, are done in the venv, so you can activate it if needed (e.g. if you want to run individual tests) and will see everything installed.

[krivard]

One important fix, one query, two optional nits

[krivard]

Also fwiw this is practically a line-for-line match for the Makefile i've been selfishly using locally, except your $(dir) is better than mine, so 👍

[krivard]

lgtm