CREST get and set location

[farshield]

Implement CREST functionality: login, get player location and set in-game destination.

[farshield]

Basic stuff done 982010a

[farshield]

• CREST getting and setting of destination now works in 37607c6
• GUI CREST character login and getting destination works aeaa594

[farshield]

• GUI for CREST config done with 0e011a97ec1f0edbcb5ce7b412f48e8d9803f5fe
• Implicit mode working with 4d7430843f8e1dbf636ebc77870035c217e535b0