Threedi-schema

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- Fix progress handler for upgrades with 0 steps

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- Move InvalidSRIDException to application.errors

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- Fix incorrect geometry in measure_location table in migration 0224
- Correct names of several migrations
- Convert ModelSchema.db.path to pathlib.Path in ModelSchema._get_dem_epsg()

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- Ensure linestrings are valid (length > 0) after crs transformation

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- Add ModelSchema._get_dem_epsg() to fetch EPSG from DEM.

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- Delete temporary model settings row after it is set for the EPSG code