Big update v1.3

Lets go, after some time we got a new version!

Whats new? well a few thing
First of all UPGRADES yep, you can now upgrade all your towers
Music, all copyright free music (all legal)
And a few bug fixes

IMPORTANT saving is per game version (i think)

When First official release comes out saving will be better AND upgrades are not free to get, you need to obtain it from a upgrade tree
So thats a hint to a later update