Add Instagram Clarendon

Merged Samuel Zachara requested to merge 456121/gnome-photos:wip/zachy/clarendon_filter into master

A brand new filter is added to the filter database. The new filter is a scientifically reverse-engineered Clarendon filter from the Instagram app. The name of the filter in the application is Trencin. On this link full documentation with source code can be found :

Edited by Debarshi Ray

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