Allow user to change raster projection

[twelch]

EPSG:6933 has some limitations, it doesn't cover beyond -86 and 86 degrees latitude - https://nsidc.org/data/user-resources/help-center/guide-ease-grids.

In these cases other projections such as UTM could be used.

• Allow user to select default equal area projection on data:import or leave it in the projection they already have (with warning that Geoblaze is limited to rectangular projections).
  • Geoblaze is limited to rectangular projections.
• raster data is reprojected on import using gdalwarp
• toRasterProjection uses the appropriate projection. May require use of proj4-fully-loaded to offer more projections. Or need a way for user to provide a definition.