throw out CtrlP and bring back Command-T

 - CtrlP is slow and needs occasional refreshing with F5
 - CtrlP fuzzy matcher sucks
 - Too many features; I seriously don't know what's going on in its prompt
 - Buffers end up in weird state after long sessions of usage
 - It seems to muck with my pwd

This reverts commit caf60d612fe923b53c9c1b75c798b1d5345a0ea4.
use `setf` for JSON and Bats