Support initializers for objects with static storage type

[ShivamSarodia]

For example

int main() {
   static int i = 3;
   printf("%d\n", i);
}

or

static int i = 3

Today, these examples raise a NotImplementedError. These initializers are different from local variable initializers: for local variables, initialization involves outputting an additional IL command, but for initializing objects with static storage,

[ShivamSarodia]

May pair well with #46

[ShivamSarodia]

Done!