Extend OffsetMember with direct operator=/operator[]

It was found to be semantically advantageous to directly pass-through certain operators such as the assignment (`=`) and array index (`[]`) operators. These would require a dereference prior to their usage otherwise but now can be directly used.

app/src/main/cpp/skyline/common/utils.h

@@ -243,6 +243,15 @@ namespace skyline::util {
         ValueType value;
 
       public:
+        OffsetMember &operator=(const ValueType &pValue) {
+            value = pValue;
+            return *this;
+        }
+
+        auto operator[](std::size_t index) {
+            return value[index];
+        }
+
         ValueType &operator*() {
             return value;
         }