prepare Model files

src/Model/chatModel.ts

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+// this file is responsible for managing chats and chat messages. objects are delegated to objectModel.ts.

src/Model/connectionModel.ts

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+// this file is responsible for managing UDN connections.

src/Model/objectModel.ts

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+// this file is responsible for managing chat objects.

src/Model/settingsModel.ts

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+// this file is responsible for all settings.

src/Model/storageModel.ts

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+// this file is responsible for reading and writing persistent data; all storage shall be handled by this file.