solarized.kak: update SecondaryCursor color alias
update color schemes to base16
revert 72f3643 update color schemes to base16

Reason: colors schemes are not as good as the original ones
Xresources: set URxvt fade color to dark
i3: explicitly set border style
vimrc: set hlsearch
vimrc: minor style fix
select.vim: do not hijack netrw