v0.3 changelog

Changes in update:

1. Bug fixes. a lot of them.
2. Changed the state calculation system leading to more stability and less weird bugs
3. Changed the save system (the old saves can still be loaded by checking the "Legacy format" checkbox in the load menu)
4. Changed saving code allowing larger builds to not become "eJw=" when saving
5. Added new cell type: Angled Wires, with them you can make more compact systems
6. Incoming signals will no longer stop the Buffer cell from buffering
7. Generators will no longer provide signal to blockers directly (you can still use wires to transmit the signal though)