Add funcs to grep/ls to add colour

Env variables are deprecated in newer version of grep

pers/grep.fish

@@ -0,0 +1,3 @@
+function grep --description 'Adds color to grep'
+  command grep --color=auto $argv
+end

pers/ls.fish

@@ -0,0 +1,3 @@
+function ls --description 'Adds color to ls'
+  command ls -G $argv
+end

source/50_misc.fish

@@ -1,6 +1,3 @@
-# All the colours
-set -x GREP_OPTIONS '--color=auto'
-
 # Prevent less from clearing the screen while still showing colors.
 set -x LESS '-XR'