Add &{} overloading (codulation)

Overloading works fine. But it is usable in practice only on perl
5.21.4+ due to core perl bug 122607.
https://rt.perl.org/Ticket/Display.html?id=122607
README generated from POD
META.json: CPAN::Meta::Converter upgraded
Changes: document codulation
codulation: more tests
POD: document how to extract a reusable chromizer
Rename ->chromize to ->chromizer
t: Use a new Chrome object for second chromizer tests
POD: fix SYNOPSIS code (warning on ambiguous deref)
Optimize the chromizer (step 1)

Step 1: cache the stingified chrome in the closure.
Optimize the chromizer (step 2)

Step 2: cache the stringified 'Reset' as a global, and use it in the
chromizer.
Changes: advertise the power of chromizers
Remove old, disabled, code; add a few comments
chromizer: rename implementation variables