optionally repair broken/invalid geometries

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This PR adds a new import flag which runs either MakeValid or GeosMakeValid to repair broken/invalid geometries.

The feature can be enabled using a flag on the command-line when importing data such as:

spatial import --tweak_module_geometry_repair=2 source

Supported values are 0=none, 1=MakeValid, 2=GeosMakeValid

I would like to experiment a bit more with this feature before considering enabling it by default, for very broken geometries it will potentially do things like convert polygons to linestrings, which may or may not be desirable.

ref: https://www.gaia-gis.it/gaia-sins/spatialite-sql-5.1.0.html#MakeValid

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These operations are quite noisy since RTTOPO outputs warnings for broken geometries.

There are in fact a lot of errors in the WOF data, mostly winding errors and intersection errors such as these:

GEOS warning: Ring Self-intersection at or near point 5.0343859999999996 52.344605999999999
GEOS warning: Ring Self-intersection at or near point 5.0540279999999997 52.541148
GEOS warning: Ring Self-intersection at or near point 5.0240309999999999 52.600085
GEOS warning: Ring Self-intersection at or near point 3.7195610000000001 51.527552999999997
GEOS warning: Self-intersection at or near point 4.4982452727272646 51.906334999999999
GEOS warning: Self-intersection at or near point -75.491668000000004 -14.928178000000001

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Running repair operation on WOF data yields some interesting cases such as this feature which is converted MULTIPOLYGON->GEOMETRYCOLLECTION.