iscon, isstr, isnum, isfloat, ispn, isarray type tests (#447) (4.2.34)

[ddehilster]

Closes #447. Follows the review choice of separate is* builtins.

builtin	1 when the value is
iscon(x)	a KB concept
isstr(x)	a string, including "" and digit strings like "42"
isnum(x)	an integer
isfloat(x)	a float
ispn(x)	a parse tree node
isarray(x)	an array (a value with several elements)

• Each returns 1 or 0 and never warns, even for an empty value. Passing more than one argument is an error.
• Unset variables: in NLP++ an unset variable reads as 0, so isnum(L("unset")) is 1. iscon, ispn and the rest are 0 for it, which is what guards like if (!iscon(L("c"))) need.
• Compiled analyzers reach them through bridgedFns.
• No name collisions: I searched the analyzers in nlp-engine, visualtext-files, package-analyzers and analyzers, and none define functions with these names.

Tests:

• New fixture tests/type-tests runs every builtin on a concept, a string, a digit string, an empty string, an integer, a float, a node, an array and an unset variable, plus direct calls. CI steps run on Windows and Linux.
• Local: 48/49 CI steps pass. The compiled-bridge step needs $GITHUB_WORKSPACE and always fails locally.
• Full English Test: unchanged.
• 20 analyzers × 21 inputs: 0 differences.
• The compiled fixture gives the same output as the interpreter.

Docs: VisualText/visualtext-files PR follows. Batched: don't tag yet.

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