Reworked Toy_String as a union, enabled -Wpedantic

Toy now fits into the C spec.

Fixed #158

Addendum: MacOS test caught an error:

error: a function declaration without a prototype is deprecated in all versions of C

That took 3 attempts to fix correctly.

Addendum: 'No new line at the end of file' are you shitting me?

tests/standalone/platform_behaviours.c

@@ -103,7 +103,7 @@ int getFileName(char* dest, const char* src) {
 	return len;
 }
 
-int main() {
+int main(void) {
 	//check the platform
 	printf("Platform: ");
 #if defined(__linux__)