ObjFW  History of src/unicode.h of merge-in:ed81079

It has been moved to the "unicode-normalization" branch until it is
ready. file: [272a9eb1c4] check-in: [149874777c] user: js, branch: trunk, size: 1176 [annotate] [blame] [check-ins using] [diff]

This explicitly excludes threading.h, as adding nullability annotations
requires adding them everywhere in the file. However, the types in there
are implementation defined, and might be pointers or not: Adding none
when it's a pointer would be an error, and adding one when it's not a
pointer would be an error, too. file: [e96c8158b3] check-in: [c5b3c8ea87] user: js, branch: trunk, size: 1289 [annotate] [blame] [check-ins using] [diff]

Forgot to add 2017, even though I already did quite some changes in
2017. file: [4902be8d2e] check-in: [44f45c2e35] user: js, branch: trunk, size: 1253 [annotate] [blame] [check-ins using] [diff]

While at it, also update the mail address. file: [19479c3eb8] check-in: [2a27cf3000] user: js, branch: trunk, size: 1247 [annotate] [blame] [check-ins using] [diff]