Add text component

[Syndesi]

The text component should be able to display text created from multiple content formats (text only, markdown, ...).

Internal properties:

• icon: Likely via reference/relation
• content-type: String, likely file extension or media type
• raw-content: The content in its raw form
• text-content: The content stripped from all formating etc. -> likely to be used in full text search etc.
• summary: Raw text only summary, used for smaller previous etc.?
• title: Optional, even shorter string

Small components should only display the title/description, bigger ones should display everything.

Additional content type formatters might be supported later on, maybe even through an additional plugin system.