restrict \p{IsUserDefined} to In\w+ and In\w+

In L<perlunicode/"User-Defined Character Properties">, it says you can
create custom properties by defining subroutines whose names begin with
"In" or "Is". However, perl doesn't actually enforce that naming
restriction, so \p{foo::bar} will call foo::Bar() if it exists.

This commit finally enforces this convention. Note that this broke a
number of existing tests for properties, since they didn't always use an
Is/In prefix.

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