Update a026 is live!

This update mostly makes some balancing changes and adds a new, prettier menu. It also adds stone walls which have higher health compared to other buildings. Castles also have higher health. There have been some minor changes to many of the sprites as well, just to make things a bit easier to see and so on. Have fun! 

Also if you notice any significant issues (that can be reliably tested) please let me know! The main issue I've found is the airship targeting system and island spread functions.

additions

 - completely redone menu
 - options menu with sliders (advanced) for certain settings
 - setting to multiply enemy sector size
 - new: walls
 - walls and castles have increased health
 - friendly airships also move around enemy islands

fixes

 - slight changes to some sprites
 - score displays correctly now
 - audio no longer spams rocket fire
 - islands no longer spawn in only one direction

experimental

 - enemy island groups are resource realistic and self contained