bindings: use ibuffer for buffer list
bindings: use regexp search for C-s and C-r
init: save selection/clipboard into kill ring
ido: use virtual buffers
ido: enable recentf mode
smex: enable smex for M-x
init: fix typo when setting variable
utils: move vbe:run-directory to the top of the file
vbe: rename `vbe/` functions and variables to `vbe:`
erc: remove debug stuff