Add ability to terminate or suspend terminal mode #152
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terminal mode can be exited by sending a “user sequence” of characters, `ESC + ‘_#Q!$’` additionally an “emergency escape” key combo of ctrl+alt+f12 is supported
# Conflicts: # video/video.ino
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Adds the ability for terminal mode to recognise a specific escape sequence (ESC+
#_Q!$) to exit terminal mode and restore regular VDP operation, allowing VDU handling to resume. Exiting terminal mode changes to mode 1.Also allows terminal mode to be suspended using a different escape sequence (ESC+
#_S!$). This allows programs running inside terminal mode to temporarily suspend terminal serial handling, allowing applications that use terminal mode to then send VDU commands. Terminal mode is resumed usingVDU 23,0,&FF, i.e. the same command sequence to start terminal mode.When the terminal is suspended, keyboard handling is still sent terminal-style, rather than restoring to VDP protocol keyboard packets. This should allow for programs to be written in CP/M to remain interactive whilst using VDU commands for output.
This code also adds an "emergency exit" key combo to quit out of terminal mode of Ctrl+Alt+F12