Update 1.4

But where's the 1.1, 1.2, 1.3, well didn't remember to write this at the time, lets continue from here shall we.

Changelog:

• Added keeping a HighestWave (saved on the browser).
• Added a HighestWave text on the Main Menu.
• Changed the Main Menu layout to be more clear.
• Changed the "How To Play" to a more detailed one.
• Changed the ingame Ui to be more clear.
• Fixed some minor irritating bugs.