Added assembler conditions for ProDOS or DOS3.3 Versions

* Setting PRODOS EQU 0 assembles the code for DOS3.3 considering the 4
byte offset introduced. Setting it to 1 compiles for ProDOS keeping the
standard BMP offsets.
* Removed the wait for key handler to allow smooth transitions during
slideshows. Now restoring the text mode has to be taken care of by the
calling software.
Added Applesoft examples

* Added the source of the Applesoft example programs for a slideshow
and a file viewer.
* Moved the source files to the Source directory
* Updated the disk image files