Optimize Tact's runtime stdlib functions

[anton-trunov]

For instance, __tact_create_address in src/generator/writers/writeStdlib.ts contains the following:

var b = begin_cell();
b = b.store_uint(2, 2);
b = b.store_uint(0, 1);
...

It may be more gas efficient to combine the two stores of constants into one:

var b = begin_cell();
b = b.store_uint(4, 3);
...

[anton-trunov]

@jeshecdom you might want to look into this at some point, the example I provided is sort of an instance of things constant propagation analysis might resolve