Use wrappers to call the kernal in bank 15 instead of implementing kernal
functionality within the cc65 libs (eats performance but is much smaller and
simpler).
Improved startup/shutdown code allows a return to the system bank without
calling the BASIC cold start vector.
git-svn-id: svn://svn.cc65.org/cc65/trunk@2793 b7a2c559-68d2-44c3-8de9-860c34a00d81
Note: These drivers are currently untested because I didn't realize that
using the drivers would need file routines, which are not available right
now. So in fact the drivers are not only untested, they are also unusable
on the target platforms, because they cannot be loaded.
git-svn-id: svn://svn.cc65.org/cc65/trunk@1732 b7a2c559-68d2-44c3-8de9-860c34a00d81
