Caprice32 v4.4.0

Compared to the 4.3 version, this release adds:

• Support for IPF files
• Windows versions
• Mostly working Plus range support (6128+, 464+, GX4000)
• More transparent support of zip files
• autopause (pause when loosing focus)
• autocmd (pass commands to execute on the command line)
• Virtual keyboard
• Screenshots
• Many bug fixes and minor features