Add z custom plugin & update upstream sources
Merge remote-tracking branches 'origin/ncanceill-omz_bootstrap', 'origin/ncanceill-plugin_git' and 'origin/lfdm-cleaning_lib' into dev
Merge remote-tracking branch 'origin/use-special-vars' into dev
Merge remote-tracking branch 'origin/ssh-agent-force-bourne-syntax' into dev
Merge remote-tracking branch 'origin/fix-plugin-gitignore' into dev
Merge remote-tracking branch 'origin/nikhgupta-features/fix-emoji-clock' into dev