Mapper module reorg / ABI pack and unpack

[g-r-a-n-t]

What was wrong?

1.) See #129
2.) The code responsible for adding non-user defined functions needed during runtime was a bit scattered.

How was it fixed?

1.) Added runtime functions for packing and unpacking arrays and used them in our dynamically generated encoding/decoding functions.
2.) Added a module named runtime to the compiler that is used to build a vector of functions needed during runtime. This better consolidates some pieces of code that had been scattered. It should make runtime-building quite a bit easier in the future. This module exposes a simple API: runtime::build(context, contract) and runtime::build_with_abi_dispatcher(context, contract).

To-Do

• OPTIONAL: Update Spec if applicable

• Add entry to the release notes (may forgo for trivial changes)

• Clean up commit history

[codecov-io]

Codecov Report

Merging #172 (f3a52e7) into master (33f779b) will decrease coverage by 1.55%.
The diff coverage is 43.43%.

@@            Coverage Diff             @@
##           master     #172      +/-   ##
==========================================
- Coverage   79.52%   77.96%   -1.56%     
==========================================
  Files          44       45       +1     
  Lines        3218     3300      +82     
==========================================
+ Hits         2559     2573      +14     
- Misses        659      727      +68     

Impacted Files	Coverage Δ
compiler/src/yul/mappers/assignments.rs	97.82% <ø> (ø)
compiler/src/yul/mappers/declarations.rs	100.00% <ø> (ø)
compiler/src/yul/mappers/functions.rs	0.00% <0.00%> (ø)
compiler/src/yul/mod.rs	0.00% <ø> (ø)
compiler/src/yul/operations/data.rs	80.95% <ø> (ø)
compiler/src/yul/runtime/abi_dispatcher.rs	30.76% <0.00%> (ø)
compiler/src/yul/runtime/functions/data.rs	0.00% <ø> (ø)
compiler/src/yul/runtime/functions/mod.rs	0.00% <0.00%> (ø)
compiler/src/yul/runtime/mod.rs	0.00% <0.00%> (ø)
semantics/src/traversal/contracts.rs	100.00% <ø> (ø)
... and 11 more

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