kaplibs: Revert commits that moved convert functions to kaplibs

These functions are now in a new library called CVG so delete them from
kaplibs. This reverts the following commits:

15a9d3020bfbd55ff58512f36fbc3a4444288d86
ea1f043d6cfcd0746693b34e469f4cfa8c3ccf3b
3924b092b8414d3bcfb1a702d1c94b5399b47aa7
0a5fcf1808dc26ec52ab4ded1f131bc4f362be77