. Add user-protection when unchecking HDD controller (as images aren't restored on a 'cancel')
. Fix possible crash when removing (via Config->Disk) either Disk2 card(s5) or HDD card(s7), then cancelling during emulation
. Fix m_buf[] size
. Split AppleWin -> Core with the functionality really needed by the emulator.
. Split AppleWin -> Utilities for generic code not called by other emulator components.
. Split AppleWin -> CmdLine for the command line option parsing.