dunst: Add icon, Prepare for drop-in config option

Added icons to be displayed on dunst notifications if there are any.

Prepared dunst config for using the newly introduced (v1.8.0) drop-in
configuration files. This allows spreading out dunst configuration over
arbitrary files in the `dunstrc.d/` folder in the usual configuration
folder. Will be perfect for less intrusive `styler` changes.

dunst/.config/dunst/dunstrc

@@ -160,10 +160,10 @@
     ### Icons ###
 
     # Align icons left/right/off
-    icon_position = off
+    icon_position = left
 
     # Scale larger icons down to this size, set to 0 to disable
-    max_icon_size = 32
+    max_icon_size = 128
 
     # Paths to default icons.
     icon_path = /usr/share/icons/gnome/16x16/status/:/usr/share/icons/gnome/16x16/devices/
@@ -415,22 +415,3 @@
 #    set_stack_tag = "volume"
 #
 # vim: ft=cfg
-# Base16 bespin - dunst color config
-frame_color = "#8a8986"
-separator_color = "#8a8986"
-
-[base16_low]
-    msg_urgency = low
-    background = "#36312e"
-    foreground = "#666666"
-
-[base16_normal]
-    msg_urgency = normal
-    background = "#5e5d5c"
-    foreground = "#8a8986"
-
-[base16_critical]
-    msg_urgency = critical
-    background = "#cf6a4c"
-    foreground = "#9d9b97"
-# Base16End bespin - dunst color config