API: code style fixes

API: make responses sortable

All responses now need to implement __toString() so they can be easily
sorted or printed.

API: initialize responses explicitly

Instead of passing unknown arrays, explicit parameters are passed.
Revision handling should now work correctly since we can pass revision=0
but a mtime.

OpenAPI Generator. Better DocBlock parsing [WIP]

This introduces a new DocBlock parser to properly generate API
specifications. It also introduces the concept of Response classes to
better specify t

OpenAPI Generator. Better DocBlock parsing [WIP]

This introduces a new DocBlock parser to properly generate API
specifications. It also introduces the concept of Response classes to
better specify the response format.

This is still very much in progress.

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