Update Perl.plist, fix issues.#23

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vabc3 wants to merge 3 commits intotextmate:masterfrom

Commits on Jan 4, 2017

Fix typo in filetest operator.
vabc3
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Remove none perl keywords: 'as', 'switch', 'case'. Remove duplicate 'eval'. Add 'given', 'when'.
vabc3
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Update keyword and function list, add 'say', 'state', etc, based on v5.24 document.
vabc3
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