Preprocess

[NMoghaddam]

I tested the new updates to both pre_processs.py and rasterize.py for the extent of Goldcoast, Australia. I approve what has been changed is aligned with what we were looking for to be included.

• The current version of pre_process.py has flags that can be specified for merging mesh blocks and settlement layers.
• The reference system for the GeoTiff format of the merged meshblock/settlement is based on WGS84 (EPSG 4326) as it was projected on the topography(DEM) file.
• rasterize.py script using the multiplier configuration will generate the Geotiff format of the merged meshblock/settlement as an independent step outside of the preprocess workflow.

I approve for the changes to be merged into the develop branch

[wcarthur]

@seballgeyer @NMoghaddam Still showing some conflicts in pre_process.py?