Release 0.2.0 of waterbear: disassemble

Note: waterbear is an assembler/disassembler for the Dreamcast VMU.

This is the second release of waterbear. Since release v.0.1.5, I've fixed some bugs, and added several bits of functionality:

• Added a disassemble command
• Fixed the way 16-bit relative addresses were being handled
• Added support for mixing string literals and numeric expressions in .byte directives
• Added a size check to the .byte directive
• Added a size check for values in the .word directive