Switch At functions around.

src/Collections/List.hpp

@@ -20,7 +20,7 @@ namespace Arbutils::Collections {
 
         inline void Clear() { _vector.clear(); }
 
-        inline const ValueT& At(size_t index) const {
+        inline ValueT& At(size_t index) {
 #ifndef NO_ASSERT
             if (index >= _vector.size() || index < 0) {
                 std::stringstream ss;
@@ -30,7 +30,8 @@ namespace Arbutils::Collections {
 #endif
             return _vector.at(index);
         }
-        inline ValueT& At(size_t index) {
+
+        inline const ValueT& At(size_t index) const {
 #ifndef NO_ASSERT
             if (index >= _vector.size() || index < 0) {
                 std::stringstream ss;