* Header files moved into include/stlink
* doc/tutorial.{pdf/tex} converted to markdown for rendering by github and easy editing
* Remove `stlink-` suffix from some C source files and move into `src/tools`
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.