Made ir-black the default color scheme

Switched away from using gui tabs and made some changes to the default text tab via set_tabline.vim plugin.

Added a new mapping <leader>t<leader> that can open a specific tab number.

vimrcs/extended.vim

@@ -11,8 +11,6 @@
 set background=dark
 
 if has("gui_running")
-    colorscheme peaksea
-else
     colorscheme ir_black
 endif