Create basic format checker for site

[atcupps]

The format checker should be able to be run from the command line with an argument for a directory to check specified. It should check .svelte and .ts files; it doesn't need to do much aside from some of the more basic rules specified in STYLE.md. Some easy ones to check, for example, would be that file ownership is specified at the top of each file, and ensuring all lines are max 80 columns. Others can be checked as well. If formatting is incorrect, it should print out helpful information about what's formatted poorly, and it should return a non-zero exit code. Otherwise it should return an exit code of 0.

[atcupps]

@alanliu2009 any interest in working on this?

[atcupps]

@alanliu2009 Suggestion I think you should call this MeiLint