v0.12.0

Changes:

• Add aborting of an ongoing search in a log window with the ESC key
• Add --dir command line argument for nuqql's config and working directory
• Cleanups and improvements
• Requires nuqql-slixmppd v0.8.0, nuqql-matrixd-nio v0.3.0,
  nuqql-mattermostd v0.3.0, nuqql-matrixd v0.6.0, or purpled v0.6.0