Add support for headerless files #216
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This pull request gives the kernal load routine the ability to load files that do not have a two-byte address header. This is done by interpreting the secondary address as described below:
If Address Source is 0, the load address is taken from the X/Y registers. If Address Source is 1, the load address is taken from the file header. Using the first bit in this way allows for partial backwards compatibility with previous versions of the load routine.
If Write Header is 0, the header bytes are not written into memory. However, if Write Header is 1, the header bytes are written into memory.
Closes #211.