Krzysztof domanski fix type compare warning (#88)

* Change static cast from "int" to use the index type

By using "int", this produces "error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]"
Static cast is technically not needed at all here since all usages of this function specialize it with an unsigned int, but in order to be future proof static cast it to the type of indices.

GLTFSDK/Inc/GLTFSDK/GLTFResourceReader.h

@@ -390,7 +390,7 @@ namespace Microsoft
                 for (size_t i = 0; i < indices.size(); i++)
                 {
                     // Verify provided index is valid before storing value
-                    if ((indices[i] * typeCount + (typeCount - 1)) < static_cast<int>(baseData.size()))
+                    if ((indices[i] * typeCount + (typeCount - 1)) < static_cast<I>(baseData.size()))
                     {
                         for (size_t j = 0; j < typeCount; j++)
                         {