Fix memory leaks

src/def_configuration.cpp

@@ -21,6 +21,7 @@
 #include "wrenpp/vm.hpp"
 #include <iostream>
 #include <algorithm>
+#include <cstdlib>
 
 namespace wren {
 	namespace {
@@ -48,25 +49,12 @@ namespace wren {
 	}
 
 	void* DefConfiguration::reallocate_fn (void* ptr, std::size_t size) {
-		if (ptr and size) {
-			//reallocate
-			char* const old_mem = static_cast<char*>(ptr);
-			char* const new_mem = new char[size];
-			std::copy(old_mem, old_mem + size, new_mem);
-			delete[] old_mem;
-			return new_mem;
+		if (0 == size) {
+			std::free(ptr);
+			return nullptr;
 		}
-		else if (ptr and not size) {
-			//free
-			char* const old_mem = static_cast<char*>(ptr);
-			delete[] old_mem;
-		}
-		else if (not ptr and size) {
-			//allocate
-			char* const new_mem = new char[size];
-			return new_mem;
-		}
-		return nullptr;
+
+		return std::realloc(ptr, size);
 	}
 
 	foreign_method_t DefConfiguration::foreign_method_fn (VM* vm, wren_string_t module_name, wren_string_t class_name, bool is_static, wren_string_t signature) {

src/vm.cpp

@@ -77,7 +77,7 @@ namespace wren {
 			return ::WrenLoadModuleResult{
 				.source = source,
 				.onComplete = (cb->load_module_complete_fn ? &load_module_complete_fn : nullptr),
-				.userData = user_data
+				.userData = nullptr
 			};
 		}
 
@@ -102,7 +102,11 @@ namespace wren {
 			assert(cb);
 			assert(cb->load_module_complete_fn and cb->config_obj and cb->owner);
 
-			(*cb->load_module_complete_fn)(*cb->config_obj, cb->owner, name);
+			//Documentation says result is the same object we returned from
+			//load_module_fn. It should then be safe to const_cast source,
+			//since it wasn't const when we got it there
+			char* const non_const_buff = const_cast<char*>(result.source);
+			(*cb->load_module_complete_fn)(*cb->config_obj, cb->owner, name, non_const_buff);
 		}
 
 		WrenForeignClassMethods foreign_class_fn (WrenVM* wvm, const char* module, const char* class_name) {