Go back to a simpler approach, that the `fzf-history-widget` is only
called on <C-Up> and ^K in normal mode and <Up> & <Down> scroll through
the history normally.
The reason behind this change is that there were still some edge cases
in which the widget was wrongfully called when normal scrolling was
intended.
This change also makes it now possible that I can use commands in the
'surrounding' of a past command by first navigating to it with the
fzf-widget and then just using <Up> & <Down>.
If a command is normally executed CMD_ON_ENTER is reseted to `ls`.
Otherwise problems can occur when for example switching the directory to
a non-repo when CMD_ON_ENTER contains `gs`.
The file should be opened if fzf returned something not the other way
around. This probably happened in the last refactoring session before
committing.
Move every file from plugins into zshrc.d as well as all bigger blobs in
the zshrc into their own files there.
Some stuff is still in there that I am not all too sure where it
belongs. TODO: Move.
Because all external plugins are now sourced over a symlink I had to
create a fork of fzf-tab for now that supports that.
See: https://github.com/Aloxaf/fzf-tab/pull/153
