v0.19.0

Changes

All significant changes to this project will be documented in the notes below.
This project adheres to Semantic Versioning.

Changed

• Improved the error logging scheme slightly, including better error messages
  for missing builder executables, e.g.latexmk caused by an incorrectly
  configured TeX Path.
• Extensions used by the Clean command are now properly configurable.
  NOTE: The command doesn't yet work properly together with Output
  Directory setting.
• Tweaked the config schema descriptions.