[issue33907] IDLE: Rename calltips and CallTips as calltip and Calltip.

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

The calltip window class name is only used in 4 places, so I decided to expand to CalltipWindow.

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<https://bugs.python.org/issue33907>
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