emacs: Change rainbow-delimiter colors + default font size

- change rainbow-delimiter to suit Putty's colors on windows machines
- change the default font size for linux. Also add font type for
emacsclient for other system types.

Signed-off-by: Ratheesh S <ratheeshreddy@gmail.com>
emacs: Fix select_current_line defun bug

Signed-off-by: Ratheesh S <ratheeshreddy@gmail.com>
emacs:yas: Add devdbg snippet

Signed-off-by: Ratheesh S <ratheeshreddy@gmail.com>