add sidetable

[wucke13]

Pull Request Overview

This pull request adds the sidetable, and with it support for structured control flow.

Testing Strategy

This pull request was not yet tested.

TODO or Help Wanted

This pull request still needs to be finished

Formatting

• Ran cargo fmt
• Ran cargo check
• Ran cargo build
• Ran cargo doc
• Ran nix fmt

Github Issue

This pull request closes #71

[codecov]

Codecov Report

Attention: Patch coverage is 14.03509% with 49 lines in your changes missing coverage. Please review.

Files	Patch %	Lines
src/validation/code.rs	14.28%	46 Missing and 2 partials ⚠️
src/core/error.rs	0.00%	1 Missing ⚠️

Files	Coverage Δ
src/core/error.rs	0.00% <0.00%> (ø)
src/validation/code.rs	43.03% <14.28%> (-14.20%)	⬇️

... and 4 files with indirect coverage changes