REFACTOR: Big code rearrangement

META: Add `@homepageURL` and `@supportURL` metadata fields to JS files
ORG: Start using git-flow with a (master/develop) branch layout
ORG: Add ESLint config
FIX: Two instances of `return` being used outside of a function (this should make the script a bit more compatible)

Release version 0.13.0.

Bump version to 0.12.0.

Update README.

Add login state detection to most parts of the script.

When we first visit the website when not yet logged in, and then
proceed to log in, we will have already polluted our "last checked"
timestamps, hence locking ourself out for an hour or so.
Additionally, if we detect a logged out state, delete all stored
timestamps. This should allow for the script to be used when switching
between accounts.

Update README.md.

Remove ItemRewards handling.

It does not exist on the page anymore and was erroring.
Cleanup ItemRewards related localStorage data.
Bump version to v0.10.0.

Fix next_claim_time being stored in the wrong unit.

It should be stored in milliseconds instead of seconds
to ensure we can easily compare with `Date.now()`.

Release v0.9

Release v0.8 with a new feature:

A notification about available trading card queues.

Merge branch 'master' of https://github.com/PotcFdk/SteamDiscoveryQue…

…ueAutoSkipper