#102 Improved memory browser to inspect any bank

[Marcos Cruz]

I think the memory browser would be much more useful with two improvements:

1. A method to go to any address directly.
2. An option to browse any 16 KiB RAM bank, for example choosing from a list: "64 KiB space" or "main memory" [which is the mode of the current browser], "RAM 0", "RAM 1", "RAM 2", etc. Even the ROMs may be selected (though not so useful for debugging).