Get map layers or Rendables from a List of Maps or Strings. Maps or Strings can contain a layertype, layername, layerprojection, and style properties. layertype values include: layer, raster, or tile For layer layertype, you can use the same key value pairs used to specify a Workspace. For raster layertype, you specify a source=file key value pair. For tile layertype, you use the same key value pairs used to specify a tile layer. Examples:

1. layertype=layer dbtype=geopkg database=/Users/user/Desktop/countries.gpkg layername=countries style=/Users/user/Desktop/countries.sld
2. layertype=layer file=/Users/user/Desktop/geoc/polygons.csv layername=polygons style=/Users/user/Desktop/geoc/polygons.sld
3. layertype=layer file=/Users/user/Desktop/geoc/points.properties style=/Users/user/Desktop/geoc/points.sld
4. layertype=layer file=/Users/user/Projects/geoc/src/test/resources/polygons.shp
5. layertype=layer directory=/Users/user/Projects/geoc/src/test/resources/points.properties layername=points
6. layertype=raster source=rasters/earth.tif
7. layertype=tile file=world.mbtiles
8. layertype=tile type=geopackage file=states.gpkg