zle: Add edit-command-line bindings.
shell aliases: Remove 'baseconv'.

This function has been moved to the 'utils' project.
shell aliases: Add git alias auto-generation.

This auto-generates aliases for git based on git commands and aliases.
For example, the git command 'git commit' has the alias 'hcommit' and an
alias such as 'git l' has the alias 'hl'. These aliases save me from
having to type the space character.