vimsplit update

Test suite added.

Error messages were being incorrectly suppressed.

Refactored code into multiple 'packages'. One day these may be
independently installable. For now it's just an organization method.

Rewrote main README and added per-package READMEs.

Also: bug fix on whiched and whichvi. They formerly propogated an error
if $EDITOR or $VISUAL were set to a non-existant executable. Also
improved the inline documentation.

Added networking scripts (i.e. vpn*); Updated style of most scripts

Added wg*, fw*, docker*, android*, pactl*, vimsplit; Update to enumerate