refactor modules to separate parsing and macros from typechecking and printing

Description

I refactored the module hierarchy to separate the morley parsing and macro expansion functionality (which we will want to extend) from the Michelson types and typechecking (which we want to make more strict).

Related issue(s)

https://issues.serokell.io/issue/TM-7 https://issues.serokell.io/issue/TM-2

This partially resolves TM-7, in that it sets up a good framework for implementing the various syntactic sugar ideas proposed there. However the architecture here is slightly different, so if this MR is accepted I will update TM-7 to reflect this.

In particular, the new overall pipeline for morley will now be based roughly on the following:

Morley.Parser : MorleySyntaxText -> MorleyTypes (including Properties)
Morley.Macro : MorleyTypes -> MichelsonTypes
Michelson.Typecheck : MichelsonTypes -> (Pass | Fail)
Michelson.Runtime : MichelsonTypes -> Computation
Morley.Testing : MorleyTypes -> (Michelson.Typecheck, Michelson.Runtime) -> (Computation, TestResults)
Morley.Printer : MorleyTypes -> MichelsonSyntaxText

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