Combine idlers

[ZixeSea]

This should add the function descripted in https://github.com/ZixeSea/SteamIdler/issues/10

• There is 1 idler and game listed under staticIdleList will always be included
• If parallelGameIdle is set higher than the amount of game listed in staticIdleList it will fill the remaining space with random games
• If staticIdleList isnm't set at all, all games will be picked at random

Also fixed a bug were skipBannedGames didn't do anything. readme has also been updated with all the new changes. And bumped the nodejs version to 14.0.0 since steam-user requires it (see https://www.npmjs.com/package/steam-user)

Keep in mind this change will break config files from older versions!!!!

[RedSparr0w]

I would also recommend changing the PR merges to use rebase or squash so the commit log is a bit cleaner, basically just shows as 1 commit for the entire PR instead of every commit made to the PR, although it is just personal preference. (I make messy PRs with lots of random commits some times 😬)