Pod::Simple filtering like Pod::Select

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One important feature that exists in Pod::Parser that doesn't in
Pod::Simple is an easy way to filter its output by section. While this can
be implemented by a specific formatter, that isn't great. When Pod::Usage
was ported to Pod::Simple, it added a rudimentary filter mechanism for its
own output, but that isn't reusable.

I've written an implementation of this for Pod::Simple:
https://github.com/perl-pod/pod-simple/pull/154. This is meant to be usable
by all subclasses without any extra work. It is a bit invasive, as it
changes when the _handle_element_start, _handle_element_end, and
_handle_text methods are called. And I'm not certain about the interface
for setting up filters. I wanted at least to be able to support Pod::Select
filters unchanged, but it doesn't need to be limited to that.

I would appreciate any feedback.

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<div dir=3D"auto"><div dir=3D"auto">One important feature that exists in Po=
d::Parser that doesn&#39;t in Pod::Simple is an easy way to filter its outp=
ut by section. While this can be implemented by a specific formatter, that =
isn&#39;t great. When Pod::Usage was ported to Pod::Simple, it added a rudi=
mentary filter mechanism for its own output, but that isn&#39;t reusable.</=
div><div dir=3D"auto"><br></div><div dir=3D"auto">I&#39;ve written an imple=
mentation of this for Pod::Simple: <a href=3D"https://github.com/perl-pod/p=
od-simple/pull/154">https://github.com/perl-pod/pod-simple/pull/154</a>. Th=
is is meant to be usable by all subclasses without any extra work. It is a =
bit invasive, as it changes when the _handle_element_start, _handle_element=
_end, and _handle_text methods are called. And I&#39;m not certain about th=
e interface for setting up filters. I wanted at least to be able to support=
 Pod::Select filters unchanged, but it doesn&#39;t need to be limited to th=
at.</div><div dir=3D"auto"><br></div><div dir=3D"auto">I would appreciate a=
ny feedback.</div></div>

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