Changes in version 2.0.0

• removed Plus/4 emulation (moved to a separate plus4emu project)
• implemented new video mode that resamples the video output to the refresh rate of the monitor; enabling this allows smoother display update at the expense of higher CPU usage and some latency in the video output
• screenshots can be saved in 8-bit RLE compressed TGA format
• quick loading of clock frequency and timing configuration presets with PageUp/PageDown keys (useful for switching between normal and fast Z80 speed)
• virtual file I/O can be disabled in the machine configuration
• bug fixes in NICK emulation
• attempt to fix OpenGL crash that occurs on some machines
• added some hacks to the audio driver to reduce timing jitter on Windows; this still needs improvements
• various minor bug fixes