Small corrections and tweaks

• Reduced the movement range of most units to give the game more time to play out.
• Resolved a bug that meant the Expansion action could never be performed.
• Updated the vertical alignment of the cannon and also applied the 'face camera' effect.
• Added cannonball projectile, fired by the cannon, obviously.
• Adjusted vertical alignment of the goblin settler.
• Resolved a bug that could cause the camera to get stuck when focusing on a tile on the outer edge of the map.
• Resolved a couple of volume levelling issues.

I'm still working away on figuring out balancing for unit values and looking to add in some random events soon.