Spiritus Astrum [P0-B13]: p1547: Towards Early Access

I have added two more achievements to the game, both for the third Campaign.

I have also fixed a lot of bugs and added some extensive improvements.

Some minor issues that were causing console spam have been fixed, and I have improved the engine effects for all ships.

I have also tweaked and improved the performance and stats of the different missiles in the game.

I fixed a more serious bug involving player targeting. In some cases, where multiple enemy ships were in view at the same time, the players ship could lock on to the wrong one.

I also fixed an issue where the enemies projectiles did not take into account the movement of the ship, making them travel too slowly.

There were quite a few other issues fixed too, including issues with enemies spawning within, and moving, through objects, some issues with one of the Campaign events, and some minor issues with paging.

I have a few more improvements to make, and then I intend to do another full retest.