Bot API 6.4-6.7

[noplanman]

?	!
Type	feature / improvement
BC Break	no
Fixed issues	n/a

Summary

The long awaited PR to update to the latest Bot API 6.7 🎉

@TiiFuchs Feedback welcome of course.

I'm wondering if the new entity classes should be organised differently. Like all the Bot* into a Bot folder and InlineQuery* ones into the existing InlineQuery one?

Also, I've introduced a public static variable Entity::$fixThumbnailRename which is true by default, which should make sure that bots using the old thumb field and method calls don't suddenly break. It converts all found thumb fields and method names to thumbnail.

Also notice the improved result objects returned in the ServerResponse object.

I've not done extensive testing yet.

[TiiFuchs]

You have my respect and gratitude.
I hereby approve thee changes.

[jacklul]

Seems like changes about thumb_url -> thumbnail_url were not applied to InlineQueryResultPhoto and InlineQueryResultVideo comments.