WIP: Initial execution engine

[AnderEnder]

No description provided.

[codecov]

Codecov Report

Merging #467 into master will decrease coverage by 1.97%.
The diff coverage is 42.85%.

@@            Coverage Diff             @@
##           master     #467      +/-   ##
==========================================
- Coverage   77.55%   75.57%   -1.98%     
==========================================
  Files          62       64       +2     
  Lines        3818     4049     +231     
==========================================
+ Hits         2961     3060      +99     
- Misses        857      989     +132     

Impacted Files	Coverage Δ
diamond-api/src/render_target/ast.rs	81.81% <ø> (ø)
diamond-api/src/exec/functions.rs	23.86% <23.86%> (ø)
diamond-api/src/exec/mod.rs	54.54% <54.54%> (ø)

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