Convert object_id to unisgned long
Use unsigned long long for object ids
Pack obj ids using unsigned long long packer
Check in EVENT_FORMAT.md
Merge pull request #81 from code-mancers/int-obj-id

Convert object_id to unisgned long long
Convert message fields to enums
Merge pull request #82 from code-mancers/enum-as-keys

Convert message fields to enums
Merge origin/master