v2.1.0

This release is entirely contributed by @ZoomRmc -- thank you so much for all the tidy ups and valuable additions to HastyScribe!

• Now multiple input files are handled correctly, including multiple glob patterns.
• IOError exit code changed to 5.
• output-file with multiple input files now ignored, preventing repeated overwrites.
• More events are now logged, including successful conversions and invalid arguments.
• HastyOptions now uses default fields for initialization.
• std/critbits are now imported to deduplicate input arguments.
• TMDMetaData now uses default object fields for initialization and is now an out parameter of markdown.md.
• Image download warning now outputs one log mark per message.
• compileDocument refactored to not use accumulation variables.
• hastyscribe_logo svg and img tag now prepared at compile time.
• Log level lvNotice now uses a dedicated color
• Normal log color changed from fgWhite to fgDefault
• utils.encode_image now uses strutils.multireplace
• Logic for some replacement operations relies on slightly tuned pegs, mostly to avoid multiple passes of findAll.
• style_tag is now a template
• Program now quits with an error if flags are given any value.
• Writing multiple files to stdout is now logged and delimited with an html-comment denoting the end of each file.
• Empty --output-file value is now an error.
• Optimized HastyScribe logo image.
• Improved logic to generate link styling.
• Implemented simple CSS minifier to reduce document size.

Some new user-facing options are implemented:

• Added option --iso is added to allow printing the date in ISO 8601 format in the html footer.
• Added option --no-clobber to prevent overwrites.
• Added option --output-dir allowing writing the resulting html files to a user-provided directory. If multiple given paths/globs resolve to files with colliding basenames, files are saved with a path hash suffix to prevent overwrites.
  This option takes precedence over --output-file.