V3 plan

[volfpeter]

Planned changes:

• Replace jinja.TemplateHeader with the generic component_selectors.ComponentHeader (breaking, the templates property will be renamed to components).
• Support non-HTML responses ( Support non-HTML responses #44 ). Breaking change because of possible name changes.
• Since there will be multiple integrations, all Jinja-specific things should probably be moved to the jinja module and shouldn't be imported in fasthx.__init__. Breaking change.
• Optional component selector for the htmy integration, see The htmy decorators shouldn't require a component selector #81

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Q: When?
A: After the htmy integration ( #42 ) is released.

Q: Major versions are coming too fast. Will there be a version 4?
A: Probably not anytime soon. The new integration ( #42 ) irons out some abstractions and the project structure.

[volfpeter]

Done in #78