Fix redirecting in error handlers#274

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iffy wants to merge 17 commits intodom96:masterfrom

iffy:i269-error-redirect

Commits on Sep 9, 2020

Aldd responseHeaders template for easy access and for setting cookies outside of handlers.
iffy
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Commits on Sep 10, 2020

Commits on Sep 11, 2020

Commits on Sep 18, 2020

Fix #211 - custom routers now get the same default error handling as normal routers
iffy
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Commits on Mar 17, 2021

Fix #269 - you can now redirect within error handlers again
iffy
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