[WIP] Support URL items

[PimCoumans]

Fixes #8. Add support for URL items in boards

• [x] Item protocol for files and URL items
• [x] URL item structs
• [x] Support items, files and URL items in boards
• [ ] Test for url item models
• [ ] Adding url items to boards
• [ ] Tests for endpoints and requets
• [ ] Endpoints, parameters and responses for url item request
• [ ] Operation for adding url items
• [ ] WeTransfer struct method for adding url items

[ghost]

	1 Message
:book:	Executed 20 tests, with 0 failures (0 unexpected) in 24.169 (24.187) seconds

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