Fish config refactor

Move things into sub-files and sub-directories
Add ensure_path function to make sure stuff doesn't get spammed multiple
times into the PATH

fish/functions/ec.fish

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+# Emacs Client
+function ec
+  emacsclient -n --alternate-editor=emacs $argv
+end

fish/functions/ensure_path.fish

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+function ensure_path --description "Ensures directories are in $PATH"
+    for pathdir in $argv
+        if not set -l index (contains -i $pathdir $PATH)
+            set -g -x PATH $pathdir $PATH
+        end
+    end
+end

fish/functions/hybrid_bindings.fish

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+function hybrid_bindings --description "Vi-style bindings that inherit emacs-style bindings in all modes"
+    for mode in default insert visual
+        fish_default_key_bindings -M $mode
+    end
+    fish_vi_key_bindings --no-erase
+end

fish/functions/ip.fish

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+# Prints current public IP address
+function ip
+  curl icanhazip.com
+end

fish/functions/src.fish

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+# reload your Fish config
+function src
+  source ~/.config/fish/config.fish; and clear
+end