v3.1.0-beta.1

Improve performance for maps with many textures (such as styles with satellite imagery), fixing excessive memory usage. (h/t @tristan-morris) #12924
Add raster-elevation property for elevating raster layers to a constant height (e.g. clouds over globe).
Add raster-emissive-strength and fill-extrusion-emissive-strength properties for controlling 3D lighting on buildings and raster layers.
Add Map getConfigProperty method for getting current style config values.
Add config support in terrain options.
Improve performance for pitched views with many fill extrusions on higher zoom levels.

Fix an issue where center: [0, 0] and zoom: 0 map options were ignored in favor of style settings.
Fix an issue with the camera not taking the short route when animating between locations across the anti-meridian.
Fix an issue where a style with imports sometimes loaded in incomplete state.
Fix an issue with rendering styles with nested imports.
Fix an issue with sources not reloading when changing language and worldview.
Fix an issue where updating a style fragment URL didn't work correctly.
Fix an issue when adding a layer with explicit slot not taking precedence over the before parameter for layer order.
Fix an issue where updating an image before initial image is loaded produced an error. (h/t @maciejmatu) #12928
Fix an issue with incorrect collisions for elevated symbols.
Fix an issue with "camera-projection": "orthographic" not working in styles with imports.
Fix an issue with tiles sometimes missing in terrain mode on views from a hill down on a valley.
Fix compact attribution style when using global CSS that sets box-sizing: border-box. (h/t @simondriesen) #12982
Remove redundant aria-label attribute in attribution control that fails accessibility conformance. (h/t @maggiewachs) #12981

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