Issue #2349677 by davidhernandez, Xen, emma.maria, runand, mortendk: Copy filter templates to Classy

Issue #2239413 by Wim Leers, blueminds: Split FilterCaption into FilterAlign (for data-align) and FilterCaption (for data-caption).

Issue #2246661 by ivanjaros: Some templates are missing 'Default theme implementation ..' statement.

Issue #2180627 by jessebeach, Wim Leers: Remove caption filter's caption-specific alignment classes.

Issue #2170085 by Wim Leers, jessebeach: Caption filter may not wrap images that are only aligned, not captioned.