Added events toggling, changed arraylists, added server history toggle...

* Added showing events (Joins/Quits) in the main text window, I forgot
that I removed it ages ago
* Changed all ArrayLists in IRCChannel to List<> and instead I
instantiate it as an ArrayList<>
* Added toggle for the saving of the entire server history
* Added a Resources folder so that nothing was stored in the root path
of the program
* Changed the Look and Feel to systemLookandFeel()