Step 3 - Multiple resolution outputs

Add ability to set multiple ortho and DSM processing resolution outputs in step 3.

It would be fantastic to be able to set multiple resolutions to create the Ortho and DSM at when setting a project to run.

EG: need a 1xGSD for survey output, but also then have to reprocess step 3 to produce a 10xGSD for general background imagery in CAD (That isnt multiple GB).

Currently this requires duplicating the step 3 folder and extra manual input, when we would rather it be produced while running over night and the pc is not needed.