refactor: move code out of ModIndex.h

Now it's in ModIndex.cpp

launcher/modplatform/ModIndex.cpp

@@ -0,0 +1,24 @@
+#include "modplatform/ModIndex.h"
+
+namespace ModPlatform{
+
+auto ProviderCapabilities::name(Provider p) -> const char*
+{
+    switch(p){
+    case Provider::MODRINTH:
+        return "modrinth";
+    case Provider::FLAME:
+        return "curseforge";
+    }
+}
+auto ProviderCapabilities::hashType(Provider p) -> QString
+{
+    switch(p){
+    case Provider::MODRINTH:
+        return "sha512";
+    case Provider::FLAME:
+        return "murmur2";
+    }
+}
+
+} // namespace ModPlatform