Reindent all source files

The indentation of various st-link source files is highly inconsistent.
Reindent all source files to 4 space indentions for consistency.

I went with 4 space indentations, as it was the most common style.
Remove toremove/

This directory has been awaiting deletion for 3 years.  It is time to
go.
Remove unused code

Remove unused #if 0'd code which has existed for years without being
used.
Merge pull request #248 from prattmic/cleanup

Initial code cleanup