Using slightly different BG colors for source blocks (greduan#138)

Make some smart-mode-line info visible in light theme (greduan#137)

The current color for the sml/global face (used for rendering e.g.
column indicator, minor mode names) was gruvbox-burlywood4. This color
doesn't invert and it's invisible in a focused window when using the
light hard variant.

This fixes this by using gruvbox-light4, which will invert correctly
and display properly in light themes.

Additional credit for Martijn Terpstra

Additional ido support.

bump 1.24.0

Fix dired inheritance issue in eshell theming.

1.12.0

Fix xterm colors

Cleaning up - modifying authors / primary contact

Revert palette to Emacs Gruvbox original.

- TODO: Create Vim-like variant
- TODO: Create Gruvbox Light

1.02 - Preparing for gruvbox light integration