Add support for retrieving exception formats from WMS capabilities #67
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This PR builds on #66 and adds additional support for retrieving the list of available Exception formats from WMS capabilities.
Although this list is usually static - varying depending only on the WMS version being used - according to the standard only the XML format is required and the image exception formats may therefore not be available on a given WMS endpoint.
Note that I have deliberately set the type definition for
exceptionFormats
toMimeType[] | string[]
because the WMS 1.3.0 spec does not use MIME-like syntax for the format strings.