Migrated Conquest mission to new mission framework

[msyulia]

What type of PR is this.

1. Bug
2. Change
3. Enhancement

What have you changed and why?

Migrated the conquest outposts mission to the new task framework.
Included factories and seaports as valid mission objectives for this mission.

Please specify which Issue this PR Resolves.

N/A

Please verify the following and ensure all checks are completed.

1. Have you loaded the mission in LAN host?
2. Have you loaded the mission on a dedicated server?

Is further testing or are further changes required?

1. No
2. Yes (Please provide further detail below.)

How can the changes be tested?

Steps:

• execute [["CON"]] call A3A_fnc_requesttask as local
• complete the mission by flipping the flag or issuing proper debug command

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Notes:

[HakonRydland]

lgtm