Model and viewer changes for proj4leaflet

[na9da]

What this PR does

Summary of changes:

• Add TilingSchemeRegistry which allows registering custom tiling scheme
• Add custom tiling scheme support for WebMapServiceCatalogItem
  • Add method createImageryProviderForCrs() to request imageryprovider with custom tiling scheme
  • Add CrsTraits
    • Use tilingSchemeGenerator trait, if defined, to generate a custom tiling scheme
    • Read CRS bounding box from GetCapabilites to get more accurate extent info for custom CRS
• Add support for creating/saving CameraView from polygon extent to more accurately describe the current view
  This is required when some CRS (eg Antarctica) require more than 2 latlon points to describe an extent precisely
• Cesium - Ignore imagery layers using custom tiling scheme
• Leaflet - Accept map options in constructor
  This is used by the plugin to initialize the map with custom projection
• DataPreviewMap
  • Create a new PreviewViewer class to manage preview map
  • Rename AdaptForPreviewMap class as PreviewItem
• TerriaViewer
  • Extract viewer loading logic into ViewerLoader to allow loading custom instances of Cesium/Leaflet viewer

TBD: Add tests for the new classes

Test me

Note that for the below tests, the proj4leaflet-plugin has be enabled and configured for the CI branch. The plugin is required for rendering custom projections. The plugin works by overriding the traits for WMS items using this CrsModelStratum.

• Using base maps with custom projection

  • Open this CI link
  • Make sure you can switch to and view Antarctica (EPSG:3031), and Tasmania (EPSG:23855) base maps.

• Previewing datasets with custom projection

  • Open this CI link
  • Open the catalog and preview datasets under Antarctica, Tasmania and Switzerland
    (Some of the Antarctica datasets are slow to load so it might take a bit for the preview to appear)
  • Make sure you can preview these datasets in custom projection even when the map viewer is in 3D / standard projection

• Adding datasets with custom projection

  • When the base map supports the custom projection

    • Open this CI link which has the Antarctica basemap active by default
    • Add datasets from the Antarctica group
    • Observe that you can view these datasets on the map
    • Observe that you are able to view feature info by clicking on the map
      Note some of the layers have a low max zoom so they'll disappear if you zoom in too close

  • When the base map does not support the custom projection

    • Open this CI link which is in 3D mode
    • Try adding some datasets with custom projection
    • Observe that there is a toast message and short report informing the user that the projection is not supported

• Restoring share links

  • Add a custom projection dataset
  • Zoom in so that you can see some details
  • Create a share link and open it in a new tab
  • Make sure the share link restores the view correctly - map mode, base map and the exact view

Checklist

• There are unit tests to verify my changes are correct or unit tests aren't applicable (if so, write quick reason why unit tests don't exist)
• I've updated relevant documentation in doc/.
• I've updated CHANGES.md with what I changed.
• I've provided instructions in the PR description on how to test this PR.