feat: add some mod api calls

- Get Project: Already existed but required a specific caller type. This
  is more general.
- Get Projects: A single call to multiple of the above

Both providers support these calls.

Signed-off-by: flow <flowlnlnln@gmail.com>

launcher/modplatform/ModAPI.h

@@ -40,6 +40,7 @@
 #include <list>
 
 #include "Version.h"
+#include "net/NetJob.h"
 
 namespace ModPlatform {
 class ListModel;
@@ -74,6 +75,9 @@ class ModAPI {
     virtual void searchMods(CallerType* caller, SearchArgs&& args) const = 0;
     virtual void getModInfo(CallerType* caller, ModPlatform::IndexedPack& pack) = 0;
 
+    virtual auto getProject(QString addonId, QByteArray* response) const -> NetJob::Ptr = 0;
+    virtual auto getProjects(QStringList addonIds, QByteArray* response) const -> NetJob::Ptr = 0;
+
 
     struct VersionSearchArgs {
         QString addonId;