MapML Support custom TCRS projections from existing GridSets
Description
The idea is to add a new MapML dedicated panel with a selector (similar to the one for Styles) that reports all the supported available GridSets that can be selected and reported as MapML TCRSs in addition to the 4 Built-in (WGS84, OSMTILE, APSTILE, CBMTILE). Newly supported TCRSs can be used in WMS/WFS/WMTS requests.
Client will also receive PROJ string specifying the CRS definition.
The idea is to add a new MapML dedicated panel with a selector (similar to the one for Styles) that reports all the supported available GridSets that can be selected and reported as MapML TCRSs in addition to the 4 Built-in (WGS84, OSMTILE, APSTILE, CBMTILE). Newly supported TCRSs can be used in WMS/WFS/WMTS requests.
Client will also receive PROJ string specifying the CRS definition.