space_before_paren has a false-positive

[kgrubb]

The regex for space_before_paren will catch pointer dereference operators and expect a space, which is probably not what we want.

Example situation: elementary/switchboard-plug-wacom#7

What we'd probably expect:

// pointer dereference, we don't really want a space here
X.Atom device_type = *((X.Atom*)data);
// multiplication operator, we do want a space here
var test = 2 * (3 + 1);

This is fairly tricky since * can be the multiplication operator which should include a space. Here's some examples with the current regex:

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[pantor]

This case is really hard to find with a regex-based approach. Instead, the space-before-paren check should make use of the AST for that.