Introduce warnings into the assembler #12
Description
The MVN assembly language is simple enough we can come up with situations where emitting a warning might be a good idea. Some I've thought about:
- Warn about the lack of comments in the code
- Warn about numerical operands as argument to normal instructions
- Warn about the use of reserved words as labels
- Add first complete version of MVN compiler tooling #13 makes mnemonics reserved words and does not allow them to be used as labels