GH-2544 allow adding files to libraries without affecting classpath

This is done by adding library-like objects into the `mavenFiles`
list in version JSONs.

api/logic/minecraft/VersionFile.cpp

@@ -41,6 +41,10 @@ void VersionFile::applyTo(LaunchProfile *profile)
     {
         profile->applyLibrary(library);
     }
+    for (auto mavenFile : mavenFiles)
+    {
+        profile->applyMavenFile(mavenFile);
+    }
     profile->applyProblemSeverity(getProblemSeverity());
 }
 
@@ -53,4 +57,4 @@ void VersionFile::applyTo(LaunchProfile *profile)
             throw MinecraftVersionMismatch(uid, dependsOnMinecraftVersion, theirVersion);
         }
     }
-*/
+*/