Implement decal parsing and API

[freezy]

Doesn't come with a renderer because we're currently focusing on scripting. See #98.

[codecov]

Codecov Report

Merging #99 into master will increase coverage by 0.1%.
The diff coverage is 96.8%.

@@           Coverage Diff            @@
##           master     #99     +/-   ##
========================================
+ Coverage    91.4%   91.5%   +0.1%     
========================================
  Files         208     211      +3     
  Lines       11532   11623     +91     
  Branches     1214    1215      +1     
========================================
+ Hits        10539   10626     +87     
- Misses        582     587      +5     
+ Partials      411     410      -1

Impacted Files	Coverage Δ
lib/vpt/decal/decal-api.ts	100% <100%> (ø)
lib/vpt/enums.ts	100% <100%> (ø)	⬆️
lib/vpt/table/table-loader.ts	92.9% <100%> (+0.3%)	⬆️
lib/vpt/table/table.ts	90.2% <100%> (+0.1%)	⬆️
lib/vpt/decal/decal.ts	91.7% <91.7%> (ø)
lib/vpt/decal/decal-data.ts	94.5% <94.5%> (ø)
lib/physics/hit-line-z.ts	84.8% <0%> (-4.1%)	⬇️
lib/vpt/ball/ball-hit.ts	77% <0%> (-0.8%)	⬇️
... and 2 more

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