This class represents different parts of an instruction.
While an easy way to understand what instruction is is to imagine that it is everything that ends with ";" e.g
require(predicate);uint a =0;foo(bar()-1);
These are all examples of instructions.
Value represents the internal parts of instruction, e.g for the instruction:
foo(bar()-1);
the bar() - call, bar()-1 expression and foo(bar()-1) calls will be the values of the instruction.
While the Value is a very important part of the engine, one will most likely never work with the Value class directly, but rather with the derived classes of the Value, which are:
