Support for self.address and bool operations

[g-r-a-n-t]

What was wrong?

We didn't support the two small features mentioned above. They are both needed for the Uniswap demo.

How was it fixed?

• analyzing the expressions
• mapping the expressions
• testing

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 #270 (81695e0) into master (f978266) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #270      +/-   ##
==========================================
+ Coverage   93.82%   93.84%   +0.01%     
==========================================
  Files          56       56              
  Lines        3922     3932      +10     
==========================================
+ Hits         3680     3690      +10     
  Misses        242      242              

Impacted Files	Coverage Δ
analyzer/src/traversal/expressions.rs	93.05% <100.00%> (+0.14%)	⬆️
compiler/src/yul/mappers/expressions.rs	97.24% <100.00%> (+0.07%)	⬆️

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