Add keypad mode escape sequences DECKPAM and DECKPNM
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This commit adds support for `DECKPAM` and `DECKPNM` escape sequences, to set keypad mode. If such escape sequence is found `Stream` emits `Screen.set_keypad_mode()`, which sets `Screen.keypad_mode` flag to one of `KeypadMode` enum values. An enumeration is used to provide more expressive values for type checking as a boolean would be able to express. Related specification: - https://vt100.net/docs/vt510-rm/DECKPAM.html - https://vt100.net/docs/vt510-rm/DECKPNM.html
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Resolves #141
Superseeds #142
This PR adds support for
DECKPAMandDECKPNMescape sequences, to set keypad mode.If such escape sequence is found
StreamemitsScreen.set_keypad_mode(), which setsScreen.keypad_modeflag to one ofKeypadModeenum values.An enumeration is used to provide more expressive values for type checking
as a boolean would be able to express.
For applications to correctly check for active keypad mode,
KeypadModeclass is exported.Keypad mode is said to be non-persistent and thus reset to numeric mode by
reset()event.Related specification: