Improve `find` command for cd widgets: exclude proc/dev etc
Improve `find` command for cd widgets: exclude proc/dev etc

When using the widget in "/", it would descend into 'dev/'.
Using '*' for the starting path would do so also with the new '-fstype'
excludes.

`cut -b3-` and `sed 1d` have been added to massage the different format
of the list.

This also uses `-L` with all calls to find, especially for the file
finders.

Ref: https://github.com/junegunn/fzf/pull/122

hyiltiz/fzf,bobpattersonjr/fzf,janlazo/fzf,NgaNguyenDuy/fzf,jebaum/fzf,wilywampa/fzf,janlazo/fzf,fazibear/fzf,tomfitzhenry/pkg-fzf,gregory-nisbet/fzf,noscript/fzf,alerque/fzf,brosander/fzf,hyiltiz/fzf,tomfitzhenry/pkg-fzf,junegunn/fzf,d4ndo/fzf,stuha/wbr-zsh,qiemem/fzf,lululau/fzf,qiemem/fzf,wilywampa/fzf,qiemem/fzf,bobpattersonjr/fzf,me-and/fzf,fazibear/fzf,wilywampa/fzf,alerque/fzf,pokey/fzf,brosander/fzf,janlazo/fzf,mjwestcott/fzf,hudak/fzf,jebaum/fzf,gregory-nisbet/fzf,infokiller/fzf,gregory-nisbet/fzf,mhartington/fzf,janusnic/fzf,me-and/fzf,mhartington/fzf,stevenqzhang/fzf,alerque/fzf,janusnic/fzf,mjwestcott/fzf,fazibear/fzf,noscript/fzf,mjwestcott/fzf,d4ndo/fzf,junegunn/fzf,stevenqzhang/fzf,infokiller/fzf,lululau/fzf,tomfitzhenry/pkg-fzf,pokey/fzf,janusnic/fzf,noscript/fzf,lululau/fzf,bobpattersonjr/fzf,brosander/fzf,hyiltiz/fzf,junegunn/fzf,pokey/fzf,stevenqzhang/fzf,jebaum/fzf,d4ndo/fzf,NgaNguyenDuy/fzf,NgaNguyenDuy/fzf,infokiller/fzf,hudak/fzf,mhartington/fzf,hudak/fzf,me-and/fzf