config: Fix data directory.

This was all messed up:

- 'pkgdatadir' wasn't something that could be substituted via autoconf
- I was still using "GUILE_2D" in the data dir env var name

Now it's all better and Sly data should be able to be found from the
pre-installation environment *and* the installation prefix.

* configure.ac (sly_prefix, sly_datadir): New variables.
* pre-inst-env.in: Set SLY_DATADIR.
* sly/config.scm.in (%pkgdatadir): Delete.
  (%datadir): New variable.  Use SLY_DATADIR env var or the configured
  datadir.
* sly/render/font.scm (load-default-font): Use %datadir.
* sly/render/shader.scm (load-default-shader): Likewise.

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