Vector extension

This extension provides a nice vector list representation, similar to vectors in C++.
Vectors are implemented as a garbage-collected pointer to a templated struct, containing a garbage-collected array of elements. Due to our current implementation of lifting/templating, typedef'ed template parameters must be declared globally.
Operator overloading is provided for basic operations such as append.
Integration with the string extension is also provided to implement show for vectors that have showable sub types.

Vector construction

Method	Example
Initialized constructor	vector v = vec[1, 2, 3, 4];
Size constructor	vector v = vec(8);
Copy constructor	vector v = copy_vector(v1);

Overloaded operators

Name	Example
Append	v1 + v2
Update assign	v1 += v2
Equality	v1 == v2
Subscript	v[i]
Subscript assign	v[i] = x
Show operator	show(x)

TODO items

• Instead of allocating the contents pointer seperately, it could instead be set to point to itself so that the entire vector is stored in a single block of memory.