WIP: Implementing arrays into the script, read more

I had intended to solve the Advent of Code puzzles in Toy, but they
don't work without arrays. I wasn't able to enable arrays in time, so
I need to focus on doing things correctly.

The most immediate tasks are marked with 'URGENT', and a lot of tests
need writing.

source/toy_array.h

@@ -40,3 +40,5 @@ TOY_API Toy_Array* Toy_resizeArray(Toy_Array* array, unsigned int capacity);
 #ifndef TOY_ARRAY_PUSHBACK
 #define TOY_ARRAY_PUSHBACK(array, value) (TOY_ARRAY_EXPAND(array),(array)->data[(array)->count++] = (value))
 #endif
+
+//URGENT: check array length from scripts