PATCH: Updated tutorial, mouse controls help, minor fixes

Just a quick update to help with ease of use (especially for new players), and some minor fixes. [list] [*] Added mouse controls help (can be disabled in new gameplay options menu) [*] The tutorial can now be retaken (via the gameplay options menu) [*] Rotating a piece in build mode is now done with the right mouse button instead of holding ALT [*] Fixes to enemy ships (mainly Goliath) [*] Miscellaneous fixes [/list] As well within the next week or two I will be releasing a free Demo version on Steam, so stay tuned for that if you haven't purchased the game but would like to try it out first.