* fix typos
This mostly fixes comments, but in a handful of places fixes bugs due to typos.
One example:
```
- insn_op_idx=None if cmsg.operand_idx == -1 else cmsg.opearnd_idx,
+ insn_op_idx=None if cmsg.operand_idx == -1 else cmsg.operand_idx,
```
* more typo fixes
* address lint issues
* more import fixes?
* address feedback from PR
---------
Co-authored-by: Brian Caswell <bcaswell@microsoft.com>