Ability to define custom events

[Fank]

As currently defined here it is possible to send custom events:
https://github.com/OCAP2/addon/blob/103b38d2bce8084e09775e9a477bcaeaaca120fe/addons/%40ocap/addons/ocap/functions/fn_addEventMission.sqf#L33-L41

But these are not shown on the web, because they needed to be registered for that.

We may need some kind of option to easily define them on our own, or/and add some predefined events.

[Fank]

Add documentation in this repo of how to use, which events do exists and how to call them

[indig0fox]

[objectiveName, objectiveNumber (if in sequence), name player]

• Terminal activated (counting down for upload)
• Terminal paused/stopped (upload interrupted)
• Terminal successfully hacked (obj complete)
• Objective destroyed (cache, plane, truck, etc)
• Sector captured (if no persistent/take and hold)
• Sector controlled by side (if accruing points by holding)
• Sector gone neutral (sector is neutral awaiting recapture)
• Game phases
  • Planning phase started (if in-game)
  • Pre-start ended, game started

[indig0fox]

added general custom event handler for next ver (including web) that will simply add text to the timeline announcing something has occurred.