[API]: Custom PayPhone messages API

[MaxtorCoder]

Changes/Features:

• Implement payphone API for custom payphone messages
• Add GetQuestByGuid and GetQuestByName getters for QuestManager
• Add QuestState getter in Quest code
• Add utilities for array adding (AddItem does not work from HarmonyLib)
• Fix merge mistakes from BepInEx merge

Example usage:

public class TestPhoneCall : PhoneCallDefinition
{
    public TestPhoneCall() : base(NPC.Get<MarcoBaron>())
    {
        var testQuest = (TestQuest)QuestManager.CreateQuest<TestQuest>();

        AddStage("Hello there - I want you to check something out for me...");
        AddStage("There's a <h1>meth business</h> close by that needs some... Cleaning...");

        var questStage = AddStage("Can you take care of it for me?");
        questStage.AddSystemTrigger(SystemTriggerType.DoneTrigger)
            .AddQuestSetter(EvaluationType.PassOnTrue, testQuest!, QuestAction.Begin);
    }
}

[KaBooMa]

🎉 This PR is included in version 1.6.0 🎉

The release is available on GitHub release

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