Initial revamp of the OSSEM Project - Data Modeling component

[Cyb3rPandaH]

• Aligned relationships fields with OSSEM (CDM and DD)
• Added event_version field: to identify data dictionaries
• Defined schema to document security_events section: audit_category and audit_sub_category only apply to Security Auditing and Sysmon events Example:

  event_id: 4657
  name: A registry value was modified.
  platform: windows
  audit_category: Object Access
  audit_sub_category: Registry
  log_source: Microsoft-Windows-Security-Auditing
  filter_in:
  - OperationType: Existing registry value modified
  event_version:
  - '0'

• Aligned source and target entities from behavior section with OSSEM CDM