Add vegetation rasters and settings table to project

[leendertvanwolfswinkel]

Add the vegetation_drag table to the settings group as 'Vegetation drag settings'

If the global_settings table references a record in the vegetation_drag table that references a raster in the columns vegetation_height_file, vegetation_stem_count_file, vegetation_stem_diameter_file, and/or vegetation_drag_coefficient_file, those rasters should also be added to the qgis project.

Names & units:

• Vegetation stem count [-]
• Vegetation stem diameter [m]
• Vegetation drag coefficient [-]
• Vegetation height [m]

Styling files: https://app.zenhub.com/files/481141268/75f7abc2-f04e-4714-b498-7edbf736d07f/download

[leendertvanwolfswinkel]

@ldebek I have tested this, and it works as it should, except for the styling. Please style the vegetation rasters using the qml files in the zip https://app.zenhub.com/files/481141268/75f7abc2-f04e-4714-b498-7edbf736d07f/download

[ldebek]

@leendertvanwolfswinkel Styling is fixed now.

[leendertvanwolfswinkel]

Perfect; please merge