Add UpdateManifest site type.

Adds the UpdateManifest site key and associated client.  This required
some additional features in the existing update machinery.

Each "version" can now (optionally) have its own download URL.

Mod Page objects can now specify that subkey matching (for that page)
should be "strict".  A strict subkey match does not fall back to matching
with no subkey if a subkey was provided but produced no versions.  It also
strips the leading '@' from the subkey.

IModDownload objects are now responsible for deciding whether a subkey
matches or not.  The default behavior is unchanged, but this allows
different mod sites to have different rules for subkey matching (which
the UpdateManifest mod site uses to force exact matches).

1 files changed, 5 insertions, 2 deletions

diff --git a/src/SMAPI.Web/Framework/IModDownload.cs b/src/SMAPI.Web/Framework/IModDownload.cs
index 13739f8f..b0e9a664 100644
--- a/src/SMAPI.Web/Framework/IModDownload.cs
+++ b/src/SMAPI.Web/Framework/IModDownload.cs
@@ -15,9 +15,12 @@ namespace StardewModdingAPI.Web.Framework
         /// <summary>The download's file version.</summary>
         string? Version { get; }
 
-        /// <summary>Return <c>true</c> iff the subkey matches this download</summary>
+        /// <summary>This download's URL (if it has a URL that is different from the containing mod page's URL).</summary>
+        string? Url { get; }
+
+        /// <summary>Return <see langword="true"/> iff the subkey matches this download</summary>
         /// <param name="subkey">the subkey</param>
-        /// <returns><c>true</c> if <paramref name="subkey"/> matches this download, otherwise <c>false</c></returns>
+        /// <returns><see langword="true"/> if <paramref name="subkey"/> matches this download, otherwise <see langword="false"/></returns>
         bool MatchesSubkey(string subkey);
     }
 }