Convert changelog to a more standardized format and rename to CHANGELOG.md

Arkerthanrequested to merge
Arkerthan/fc-pregmod:changelog into pregmod-master

I didn't convert the pre 0.10.7.1 versions, just changed the dates to ISO for us non Americans. If someone wants to convert that too, feel free to do so, I don't see the value in it.

Edited by Arkerthan

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