Tmux: reconfigure tmux dot_files for GNU stow

* Rename .tmux_light.conf -> .tmux_utf8.conf. This file is with utf8
  symbols. This is intended to use with ssh connection.

* Rename .tmux.conf -> .tmux_powerline.conf. This config file contains
  settings with patched font font glyph. This is to be used with
  powerline env.

* Create symbolic link .tmux.conf -> .tmux_utf8.conf. This will help in
  pointing to default tmux configuration file of choice with little
  hassle.

Signed-off-by: Ratheesh S <ratheeshreddy@gmail.com>
Tested-by: Ratheesh S <ratheeshreddy@gmail.com>
Powerline: Align powerline configuration to stow

Put power configuration files which should be reside in .config under new
.config folder.

Signed-off-by: Ratheesh S <ratheeshreddy@gmail.com>
Tmux: Add new configuration with no utf8 glyphs

This configuration is used in the env where there is no utf8 glyph
support or utf8 glyphs are displayed ugly(eg: Putty) especially in
windows env.

New configuration file is named as '.tmux_noutf8.conf'

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