Update 1.6.13 - Fixed stuttering issue

Patch notes: - Added the option to switch between windowed, borderless fullscreen and exclusive fullscreen modes. Exclusive fullscreen mode might not be ideal for 2 screen set-ups but it should almost completely eliminate the stuttering issue that some computers exhibit. It seems that XNA possibly doesn't play nice in windowed and fullscreen borderless modes. - You can now pause the game during the Ready and Respawn states. - Leaderboard labels no longer use platinum for 1st place and is now the more normal colour scheme of gold, silver, bronze and, for the rest of the top ten, cyan. Also the top ten scores' size are constant but still slightly bigger than the rest. - The Steam Rank display above your level time on the map screen also doesn't use platinum for first place. - The right hand level cleared button now says "Continue" instead of "Back to Map" as I think it reads a little better. - The crash logging system was removed in an attempt to reduce the stuttering issue but forgot to add it back for version 1.6.11 since it didn't improve things. It's now back in to catch crashes and write a stack trace to file. I'm aware of the occasional lag spikes which I will look more into at some point but for the near future it's time to go back to fixing/making features :) Thanks for reading, Marios.