Enhancements:

• Rewrite file parsers to move read/write logic out of init
• add parser-specific Commands menu items
• support string substitution for more complex config subprocess commands
• select lines via clicking line numbers
• display absolute path to program in about dialog
• theme/icon support, add missing icons, move off django icons

Bug fixes:

• enable "Copy link location" context menu action
• Save As should add file to recent files and history menus
• improve PySide2/PyQt5 support
• ensure app temp dir exists before loading sources
• only set selection clipboard on OS that supports it

Maintenance:

• rm deprecated -dark flag
• remove no longer necessary utils.loadUiType
• safer subprocess usage, removing all shell=True usage
  • Windows users: Please take note that a previous Windows-only workaround for using USD paths with spaces was removed, as itshould no longer be necessary. If it does turn out to still be a bug, we'll want to bring back the shell=True python subprocess and quote the file paths again.
• better defaults for diff and text editor on Windows
• add missing docstrings
• clarify install instructions

Full Changelog:0.14.0...0.15.0