V1.5.1 Tiny Update

Made some tiny changes to V1.5

CHANGES:

- Made the tutorial at the start of the game optional, so anybody who is

replaying the game doesn't have to sit through it.

- Rewrote the descriptions for the Upgrade Items to better explain how

they are used.

- Made slight tweaks to the manual .txt file (updated the manual to list the new controls. My apologies to

those I may have confused with this mistake as the 1.5 manual still listed old controls.)