allow terminal query responses to override TERM

[dankamongmen]

if we get a vouchsafed identification from the terminal itself, we ought allow it to override the TERM variable for the purposes of our heuristics. Now that #1469 is complete, we're sending all queries relevant to identification. Pull the answers out, use them to set the termname authoritatively, and pass this into apply_heuristics() during terminal discovery.

We ought be able to identify at least:

• WezTerm
• kitty
• alacritty
• foot
• XTerm
• VTE

and we ought check for others.

Note that this does not include querying terminfo with the answer. For now, we will continue to rely on TERM for that.

[dankamongmen]

state: 9 char: 27 1b
state: 1 char: \ 92 5c
string terminator after [xterm-kitty]
state: 0 char: 27 1b
state: 1 char: [ 91 5b
state: 2 char: ? 63 3f
state: 14 char: 6 54 36
state: 18 char: 2 50 32

[dankamongmen]

string terminator after [~VTE]

[dankamongmen]

string terminator after [XTerm(366)]

[dankamongmen]

state: 9 char: 6 54 36
state: 10 char: D 68 44
state: 9 char: 27 1b
state: 1 char: \ 92 5c
string terminator after [mlterm]
state: 0 char: 27 1b
state: 1 char: [ 91 5b
state: 2 char: ? 63 3f
state: 16 char: 1 49 31

[dankamongmen]

state: 5 char: 9 57 39
state: 5 char: . 46 2e
state: 5 char: 0 48 30
state: 5 char: 27 1b
state: 1 char: \ 92 5c
string terminator after [terminology 1.9.0]
state: 0 char: 27 1b
state: 1 char: [ 91 5b
state: 2 char: ? 63 3f
state: 16 char: 6 54 36
state: 20 char: 4 52 34
state: 20 char: ; 59 3b
state: 20 char: 1 49 31

[dankamongmen]

i don't see anything yet for konsole, contour, st, or urxvt, nor alacritty actually

[dankamongmen]

string terminator after [FOOT]

[dankamongmen]

we're now extracting these strings and matching them against queryterm_e enums.