Rewrote getParams() to be more dynamic and shorter

`getParams()` is a lot of copypasta paired with a looong chain of IFs..
That is the past! Modern programs don't use IFs anymore and so should epl!

Implements an array of GET-settings which look like this:
```js
{
  name: "alwaysShowChat",
  checkVal: "true", 
  callback: function(val) { chat.stickToScreen(); }
}
```
Further information is available in the sourcecode.