Loaders: Don't automatically set the current process every time we load an application.

The loaders will now just create a Kernel::Process, construct it and return it to the caller, which is responsible for setting it as the current process and configuring the global page table.

src/core/loader/elf.h

@@ -30,7 +30,7 @@ public:
         return IdentifyType(file);
     }
 
-    ResultStatus Load() override;
+    ResultStatus Load(Kernel::SharedPtr<Kernel::Process>& process) override;
 
 private:
     std::string filename;