Added global text expansion for markdown headings (mdh1..4).
Fixed metric insertion into database on shutdown.
Fixed typo: occured => occurred.
Added global text expansion for Markdown horizontal rule.
Merge branch 'feature/md-heading-snippet' into develop

Conflicts:
	README.md
	more_better_ui.ahk
Added port of distance_of_time_in_words from Ruby.
Added tray popup indicating script startup.
Merge branch 'feature/init-notification' into develop
Fixed trailing whitespace.
Merge branch 'feature/fix-saving-git-hash' into develop
Configured to use local temporary directory instead of script directory.
Merge branch 'feature/use-appdata' into develop

Conflicts:
	more_better_ui.ahk
Force single instance to prevent nag prompt.
Updated .gitignore to reflect use of APPDATA for storage.
Fixed legacy UTC comment typo.
Database variables made more consistent.
Merge branch 'feature/refactor-db-variables' into develop
Changed variable scope to fix get_latest_git_commit_hash.
Capture call history with a timestamp to better show usage.
Improved initialization message to list time saved, call count, and overhead scripted time.