Put a check around @ symbols in colors.vim.

Update todo.

Update headings with br_blue.

Update selection colour ... _again_

Add in line blue gray for strings, change other things around it.

Add in guard around plugin running re colorscheme loaded.

Tweak tmux status again.

Try another todo colouring.

Css, sh and tmux tweak.

Merge branch 'feature/more_colours' into develop