Add support for `@JsonInclude(content=Include.NON_NULL)` (and NON_EMPTY) for Maps

[cowtowncoder]

(and other inclusion values)

Currently use of something like:

@JsonInclude(Include.NON_EMPTY)

only affects value itself. But for structured values (arrays, Collections, Maps), there is also the question of inclusion strategy for contents.
Currently the only way to control such inclusion is via global feature SerializationFeature.WRITE_NULL_MAP_VALUES, and that only affects handling of Maps.

But it would seem reasonable to add an additional property in @JsonInclude, say, contents, and modify structured type serializers to consider this for filtering.
The first one to use it with should be Map (and specialized variants like EnumMap). But due to amount of work involved, let's add support for arrays and Collections if and when specifically requested.

[cowtowncoder]

Implementation was slightly more involved than expected, but things work now.

Note, however, that #588 should be implemented too, to be able to properly cascade case of Maps that are empty of serializable values: that is, Maps where map.size() != 0 but where all entries are suppressed.