more refactoring, less warnings, less stuff kept around

initial refactoring for interfacing the game engine from the ios frontend (game doesn't run yet)

I'm not saying this fixes anything, I'm just hoping it inspires Tiy to take an interest in the theme. (removes the background water effect that just wasn't working, puts in new spray objects including removing the copyrighted one, tries for a sand that doesn't look like sandpaper)