Recognize @unit parameter documentation tag. Not used in any output yet.
Simplify file extension check.
Rename Scanner and Parser classes to SourceScanner and SourceParser to avoid naming conflicts.
Rework px_process_params.py into a fully featured program.
Improve DokuWiki formatting.
Merge remote-tracking branch 'remotes/origin/master' into param_tool
Merge pull request #766 from PX4/param_tool

Improvements to parameter documentation script