Update tmux config, add basic shortcuts

.tmux.conf

@@ -22,6 +22,23 @@
 
 set -g mouse on
 
+# remap shortcut prefix from 'C-b' to 'C-z'
+unbind C-b
+set-option -g prefix C-z
+bind-key C-z send-prefix
+
+# Reload tmux.conf in this session
+bind r source-file ~/.tmux.conf
+
+bind h split-window -h
+bind v split-window -v
+
+# switch panes using Alt-arrow without prefix
+bind -n M-Left select-pane -L
+bind -n M-Right select-pane -R
+bind -n M-Up select-pane -U
+bind -n M-Down select-pane -D
+
 set-option -g status-position top
 # Can't use theme plugin without risk of repo update overwriting data?
 #source-file "${HOME}/.tmux-themepack/powerline/double/green.tmuxtheme"