Use a Makefile instead of a Jamfile.

 * Simplifies things a lot.
 * Also switch to using the system's libcolumnlistview.
Nuke all the Jam and ColumnListView stuff.

The previous commit makes them no longer needed.
RSRC -> RDEF.

This makes the Makefile-Engine run mimeset, which fixes #1.
Use a different icon so DocumentViewer is not confused with BePDF.

Made by @Giova84. Fixes #3. Thanks!