feat: add a ModUtils::validate

moves the reading of mod files into `ModUtils` namespace

Signed-off-by: Rachel Powers <508861+Ryex@users.noreply.github.com>

launcher/minecraft/mod/Mod.cpp

@@ -43,6 +43,7 @@
 
 #include "MetadataHandler.h"
 #include "Version.h"
+#include "minecraft/mod/ModDetails.h"
 
 Mod::Mod(const QFileInfo& file) : Resource(file), m_local_details()
 {
@@ -68,6 +69,10 @@ void Mod::setMetadata(std::shared_ptr<Metadata::ModStruct>&& metadata)
     m_local_details.metadata = metadata;
 }
 
+void Mod::setDetails(const ModDetails& details) {
+    m_local_details = details;
+}
+
 std::pair<int, bool> Mod::compare(const Resource& other, SortType type) const
 {
     auto cast_other = dynamic_cast<Mod const*>(&other);
@@ -190,3 +195,8 @@ void Mod::finishResolvingWithDetails(ModDetails&& details)
     if (metadata)
         setMetadata(std::move(metadata));
 }
+
+bool Mod::valid() const
+{
+    return !m_local_details.mod_id.isEmpty();
+}