#141 Flash linker device support

[Rafael Vuijk]

I would like to have support for flash linker devices.
I already modified sources to make this work a bit. I
can load/play from original F-Zero cartridge. It's
pretty slow without caching.
Anyway, this could be used for reverse engineering of
special function cartridges, like the GBA camera, movie
players etc.
The source modification I made for this was to create a
rom class with patch/get/read/write functions.
Currently it ignores the patches and always reads from
linker device. Viewing memory in debug mode is probably
screwed up. Got some problem with Insight requiring to
load an ELF file, which I don't want.