Removing urvt transparency, cleanup tmux config: remove mouse support, fix colors using new style syntax

tmux/.tmux.conf

@@ -19,7 +19,6 @@ bind c new-window -c '#{pane_current_path}'
 
 # stop tmux from renaming the window every time you run a command
 set-option -g allow-rename off
-set-option -g pane-active-border-fg blue
 
 # select panes with vim keys
 bind h select-pane -L
@@ -39,12 +38,11 @@ set -g mode-keys vi
 
 # enable mouse control (click wind, panes, resizable panes) - as of tmux 2.1
 # copy/paste: shift+left click to highlight, then shift+middle to past
-if-shell '[ $(echo "$(tmux -V | cut -d" " -f2) >= 2.1" | bc) -eq 1 ]' \
-    'set -g mouse on' \
-    'set -g mode-mouse on; set -g mouse-resize-pane on; set -g mouse-select-pane on; set -g mouse-select-window on' 
+## tmux < 2.1
+#set -g mode-mouse on; set -g mouse-resize-pane on; set -g mouse-select-pane on; set -g mouse-select-window on
+## tmux >= 2.1
+#set -g mouse on 
 
-#set -g mouse on
-#'set -g mouse on; set -g mouse-utf8 on' \
 
 bind-key Tab last-window
 bind-key BTab previous-window
@@ -71,10 +69,8 @@ set-option -g status-right-length 40
 set-option -g status-right " #[fg=brightwhite,bg=black] %a, %d %b %H:%M #[fg=colour18,bg=colour4] #(whoami)@#h "
 
 # Pane border
-set-option -g pane-border-bg default
-set-option -g pane-border-fg brightblack
-set-option -g pane-active-border-bg default
-set-option -g pane-active-border-fg white
+set-option -g pane-border-style bg=brightblack,fg=brightblack
+set-option -g pane-active-border-style bg=default,fg=white
 
 # Pane number indicator
 set-option -g display-panes-colour brightblack
@@ -83,7 +79,3 @@ set-option -g display-panes-active-colour brightwhite
 # Clock mode
 set-option -g clock-mode-colour white
 set-option -g clock-mode-style 24
-
-# REQUIRES TMUX 2.x
-# use F12 to move to inner/outer tmux sessions when nested
-# https://medium.freecodecamp.org/tmux-in-practice-local-and-nested-remote-tmux-sessions-4f7ba5db8795