Rework partial GameModeMap and GameLobby codes

[SadPencil]

• Unified duplicated codes in GameMode and Map. For example, MultiplayerOnly is a setting that can be either defined in GameMode and Map. Now, the duplicated codes are merged. Priority: Map > GameMode.
• ForceRandomStartLocations setting can also be turned on with co-op missions (IsCoop)
• Forced Random Teams has been renamed to Forced No Teams in UI and source codes, because the original meaning seems wrong.
• Fix a bug where the team mapping (in player extra options panel) breaks the team setting with co-op missions (IsCoop)
• Support specifying non sequential locations by specifying AllowedStartingLocations. For example, in a co-op mission based on a 4P map, the players might be positioned in 1 and 3 instead of 1 and 2, while MaxPlayers=2. The AIs are provided in co-op related settings instead of regular AI players.
• Also contains and closes https://github.com/CnCNet/xna-cncnet-client/pull/519, supporting randomized game mode

Note: I can't separate the features, refactors, and bug fixes as separate PRs, because: (a) they rely on one others, and (b) we don't merge PRs in time -- so it will be much painful maintaining many PRs that depend on one others.

[github-actions[bot]]

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[MahBoiDeveloper]

@SadPencil Please, resolve the conflict with develop.

[SadPencil]

@SadPencil Please, resolve the conflict with develop.

Thanks for the remind. Updated.

[SadPencil]

Note that I can't separate Fix a bug where the team mapping (in player extra options panel) breaks the team setting with co-op missions (IsCoop) into a standalone PR. It requires a deep refactor (e.g., this PR) to fix this bug.