Update .jifallow to support ignoring specific files

[0necontroller]

I propose to update .jifallow file to .jif-file

Which should now allow having an [ALLOW] section, and a [IGNORE] section

Reason

Sometimes you might want to ignore a file that is still pushed to git

Other proposal on file name

we can move to a jif.yml so we don't create new syntax overall

allow:
    - test.js
    - test.tsx

ignore:
    - music.ts
    - musica.tsx