Serialize alternate projection links for known applicable MapML: projections

[prushforth]

Related

Currently, 'well-known' MapML: authority projections are serialized as alternate projection links in each MapML document:

<map-link rel="alternate" projection="OSMTILE" href="https://example.org/geoserver/msc/wms?format_options=mapml-wms-format%3Aimage%2Fpng&request=GetMap&crs=MapML%3AOSMTILE&service=WMS&bbox=-1.9771353430346526E7%2C3550701.251005205%2C2.0000184074674536E7%2C1.8524695031846646E7&format=text%2Fmapml&layers=CURRENT_CONDITIONS&width=364&version=1.3.0&height=768"></map-link>
<map-link rel="alternate" projection="APSTILE" href="https://example.org/geoserver/msc/wms?format_options=mapml-wms-format%3Aimage%2Fpng&request=GetMap&crs=MapML%3AAPSTILE&service=WMS&bbox=-5266985.219718212%2C-5266985.219718212%2C9266985.219718212%2C9266985.219718212&format=text%2Fmapml&layers=CURRENT_CONDITIONS&width=364&version=1.3.0&height=768"></map-link>
<map-link rel="alternate" projection="WGS84" href="https://example.org/geoserver/msc/wms?format_options=mapml-wms-format%3Aimage%2Fpng&request=GetMap&crs=MapML%3AWGS84&service=WMS&bbox=-177.60908974209215%2C30.366141302758248%2C179.66471039483983%2C83.72878702993546&format=text%2Fmapml&layers=CURRENT_CONDITIONS&width=364&version=1.3.0&height=768"></map-link>

If there are custom MapML: authority projections defined by the local service, their alternate links should also be serialized alongside the pre-defined projections:

<map-link rel="alternate" projection="OSMTILE" href="https://example.org/geoserver/msc/wms?format_options=mapml-wms-format%3Aimage%2Fpng&request=GetMap&crs=MapML%3AOSMTILE&service=WMS&bbox=-1.9771353430346526E7%2C3550701.251005205%2C2.0000184074674536E7%2C1.8524695031846646E7&format=text%2Fmapml&layers=CURRENT_CONDITIONS&width=364&version=1.3.0&height=768"></map-link>
<map-link rel="alternate" projection="APSTILE" href="https://example.org/geoserver/msc/wms?format_options=mapml-wms-format%3Aimage%2Fpng&request=GetMap&crs=MapML%3AAPSTILE&service=WMS&bbox=-5266985.219718212%2C-5266985.219718212%2C9266985.219718212%2C9266985.219718212&format=text%2Fmapml&layers=CURRENT_CONDITIONS&width=364&version=1.3.0&height=768"></map-link>
<map-link rel="alternate" projection="WGS84" href="https://example.org/geoserver/msc/wms?format_options=mapml-wms-format%3Aimage%2Fpng&request=GetMap&crs=MapML%3AWGS84&service=WMS&bbox=-177.60908974209215%2C30.366141302758248%2C179.66471039483983%2C83.72878702993546&format=text%2Fmapml&layers=CURRENT_CONDITIONS&width=364&version=1.3.0&height=768"></map-link>

<map-link rel="alternate" projection="USNATATLAS" href="https://example.org/geoserver/msc/wms?format_options=mapml-wms-format%3Aimage%2Fpng&request=GetMap&crs=MapML%3AUSNATATLAS&service=WMS&bbox=-177.60908974209215%2C30.366141302758248%2C179.66471039483983%2C83.72878702993546&format=text%2Fmapml&layers=CURRENT_CONDITIONS&width=364&version=1.3.0&height=768"></map-link>