Add Z80 registers, last byte written to the ULA, tstates since interrupt and the primary and secondary memory control ports as debugger variables. Extend breakpoints on paging events to more peripherals: Beta 128, +D, Didaktik 80, DISCiPLE, Opus Discovery and SpeccyBoot. Fix crash on widget UIs when hitting the close icon on the title bar several times. Fix loading bugs when the detect loaders feature is being used.