VSEMUR 0.2.0

Switch internal structure to use Rust traits to hide state from functions that don't require access to it. Implement a proper memory map and begin implemention of peripherals and devices (both internal and external) to the system.

VSEMUR 0.1.0

Basic development started, including interface exposed to users of libvsemur, decode and disassembly logic, and some execution logic for CPU. Peripherals still have a long way to go and much cleanup is needed in the code. But this release marks the point at which I have a somewhat concrete design/plan in place.