Fix #465 add option for redirect code to implement post/redirect/get pattern#466

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NicoHood wants to merge 3 commits intogetgrav:developfrom

NicoHood:redirect_code

Commits on Dec 27, 2020

Fix #465 add option for redirect code to implement post/redirect/get pattern
NicoHood
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Commits on Jan 8, 2021

Added defaults for redirect process option
NicoHood
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Commits on Jan 15, 2021

Fixed redirect parameter parsing as suggested by @mahagr
NicoHood
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