Mainly a tidy-up to remove old, unused code from memory.cpp.
Also:
* Disk][ now returning floating bus for I/O register reads (still a few todo's to check).
* Fixed#232 (mouse VBl IRQs were still occurring after card removed!)
The Configuration Dialog -> Disks tab now has combos to show
insert/eject disks, as well as it now the images are automatically
swapped if you try to insert on one drive the image connected to the
other
The Apple logo was redone following the same-ish colour pattern but with
a more modern look.
(*) Updated based on first review:
- Removed bmp from this pull request (coming later)
- Corrected resource's constants values and deleted unused one
- Initializing variables in CPageDisk constructot
