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La til overkill beskyttelse mot XXS, Zap er ikke konsistent på om den greier cross-site scripting.

See merge request !2

Restricted username to <= 25 characters, no "?" in name and added some overkill encoding in safetify for input encoding.

# Conflicts:
#	src/main/java/inf226/inchat/Handler.java

Added Encoding for httml of input, this means html tags can't be inserted and read as code, which should prevent both httml insertion and javascript insertion.