made window titles support additional variables. Fixes #178

tmux_conf_theme_window_status_format and tmux_conf_theme_window_status_current_format
variables now understand:
  - #{circled_session_name}
  - #{hostname}
  - #{hostname_ssh}
  - #{username}
  - #{username_ssh}

.tmux.conf.local

@@ -103,6 +103,11 @@ tmux_conf_theme_terminal_title='#h ❐ #S ● #I #W'
 # window status style
 #   - built-in variables are:
 #     - #{circled_window_index}
+#     - #{circled_session_name}
+#     - #{hostname}
+#     - #{hostname_ssh}
+#     - #{username}
+#     - #{username_ssh}
 tmux_conf_theme_window_status_fg='#8a8a8a'              # light gray
 tmux_conf_theme_window_status_bg='#080808'              # dark gray
 tmux_conf_theme_window_status_attr='none'
@@ -113,6 +118,11 @@ tmux_conf_theme_window_status_format='#I #W'
 # window current status style
 #   - built-in variables are:
 #     - #{circled_window_index}
+#     - #{circled_session_name}
+#     - #{hostname}
+#     - #{hostname_ssh}
+#     - #{username}
+#     - #{username_ssh}
 tmux_conf_theme_window_status_current_fg='#000000'      # black
 tmux_conf_theme_window_status_current_bg='#00afff'      # light blue
 tmux_conf_theme_window_status_current_attr='bold'