Minimized Tmux building.

Global session no longer starts HTOP by default.
Primary session is no longer created. Thus, new local shells not already in a
Tmux env will start a new, empty, session.
Prompt system refactor.

Moved `promptinit` to near-eof.
Exported "steef" prompt out of zshrc and into own file, as it should be.
Cleaned up alias definitions.
Add OpenStack scripts to path, if exists.
Refactored key bindings.

Removed conflicting/duplicates.
Added ^v to open in vim.