Environment flags

Environment flag for VM

- VM_TRACE : 1\0 - enable or disable trace logging (default 0)
- VM_ERROR : 1\0 - enable or disable error logging (default 1)
- VM_KEEP_MEMORY : 1\0 - when halt cpu disable or enable clearing memory table (default 0 - clearing)
- VM_MEM_FAST_WRITE: 1\0 - enable or disable fast-write mode to devices (see fast-mode addressing)
- C69_BIOS_HPET : 1\0 - enable using hardware hper timer (default 0)
- VM_WARMUP_DEV : 1\0 - enable warm-up devices on plug-connect (default 1)
- VM_SHUTDOWN_DEV : 1\0 - enable shutdown devices on halting processor (default 1)
- VM_SYM_ENCODING : "utf8" - set encoding of debug symbols (default "IBM037")
- SKIP_WARNING : 1\0 - skip display warning (default 0)

Note: Valid value for env flags:

"1", "true", "on", "enable", "yes" "0", "false", "off", "disable", "no"

Additional Flags

- RUNE_EMOJI_USE : 1\0 - using emoji in console output
- RUNE_COLOR_USE : 1\0 - using coloring in console output
- RUNE_NIER_USE : 1\0 - using Nier formating test in console output

Note: Coloring, Nier, Emoji on Windows work only in Windows Terminal