[issue19903] Idle: Use inspect.signature for calltips

[Terry J. Reedy]

Terry J. Reedy added the comment:

Several builtin functions have recently gotten the Arg clinic treatment.  So I think it is now time to switch.  Before closing #29653 as a duplicate, I discovered that inspect.signature also handles functools.partials correctly, while the other inspect functions do not.

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versions: +Python 3.6, Python 3.7 -Python 3.5

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