Iterate through vector features

[Fabian Thiel]

Feature request: being able to iterate through the vector features/geometries, aka "Center Mapview on previous/next Feature" buttons -> Maybe below: Show glimpse of attribute table (without all the attribute table buttons, just the ones needed; if API allows it) and if feature is selected in this attribute table, also focus mapview on that feature)

Not sure whether this could be implemented in the Mapviews window beneath Vector Rendering, or better in separate entity (e.g. bottom section where "Time Series" + "Profile View" are)

[Benjamin Jakimow]

closes #26 : Labeling dock allows to iterate through vector features. map canvas will be centered to each vector feature

Signed-off-by: benjamin.jakimow [e-mail]

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