Nyall Dawson 9da6a03b50 Add API for specifying fallback CRS and layer WKB type to use
for QgsVectorLayer, when constructing a layer with a URI which
may be invalid

These may be used for layers where the geometry type/CRS is
known in advance, and where the layer path may not be
initially resolvable. (E.g. layers with a URI pointing to a
non-existant file). It is only ever used if the layer cannot
be resolved, otherwise the actual layer geometry type will be
detected and used for the layer.
2019-04-19 06:07:13 +10:00
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