Always allow loose geometry creation, raise on operation that need more strict geometries

[BuonOmo]

See #247 (Loose Invalidity handling for geometries)

TODO:

• List OGC methods that need validity
• do the metaprogramming part (RGeo 3.0 Roadmap #247 (comment)) and make sure it gives understandable methods (e.g. using method(:contains?) gives something understandable w. correct arity)
• implement the pure ruby #invalid_reason which can bail out to Unknown validity if a check is not yet implemented in the pure ruby version
• handle RGeo::GeosError for usage of unsafe methods that are not handled correctly by geos.

[BuonOmo]

Closed by #275