0.7.0

0.7.0

This release fixes numerous bugs since 0.6.0. In addition,
it brings:

- "shutdown mode" for splash screens (so system shutdown can
  be splashed.
- Separation of splash themes from splash plugins.  This way
  more than one theme can use the same plugin, but with different
  images and other content.
- A new splash plugin called "two-step" which shows two animations,
  one synchronized to boot time, and one displayed very quickly
  at the end of boot.
- A new splash plugin called "script" which makes it possible to
  write themes without build goo and without knowing C.
- pkgconfig fix ups to facilitate out-of-tree plugins
- More debuggability
- Better performance when a lot of small things change all over the
  screen.