Now that cc65 programs can run as SYS files themselves my ProDOS Loader ulimately...

Now that cc65 programs can run as SYS files themselves my ProDOS Loader ulimately has to change from a minimalistic shell replacement to a pure loader (without exit hook). This approach simplifies several things. However the "reboot after exit" option now present as a ProDOS Loader variant has to move into the cc65 program.

git-svn-id: svn://svn.cc65.org/cc65/trunk@4172 b7a2c559-68d2-44c3-8de9-860c34a00d81