Remove deprecated constants

type:breaking

For LIGO developers

We have had deprecated constants for a long time, but we started emitting warning messages about deprecation 45 days ago (Mar 15 2022, !1623 (merged)).

This MR finally removes deprecated constants.

Changelog details:

Deprecated constants

In previous versions of LIGO, warnings were emitted for deprecated constants (e.g. balance, sender, etc.). We finally remove those constants. Please consult API documentation in ligolang.org to find a new constant that can replace the old one in your contract.