feat: 2d triangle mesh examples

[keenancrane]

Description

This PR adds additional examples (and features) to the triangle-mesh-2d domain, which mimic several "hand drawn" diagrams from Crane et al. It also adds several features in support of these diagrams, namely:

• add a rotateBy(vector,angle) function to Style
• restore the Circle-Line disjoint constraint
• add a lineLineIntersection function to Style, which computes a line intersection given pairs of points along the two lines
• add an angleOf(vector) function to Style, which computes the angle with the positive x-axis
• disable showing the diagram history in the browser-ui (which dramatically speeds up feedback)
• update vim syntax highlighting

Checklist

• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• My code follows the style guidelines of this project (e.g.: no ESLint warnings)

[codecov]

Codecov Report

Merging #808 (756ecb0) into main (4a94cac) will decrease coverage by 0.31%.
The diff coverage is 14.89%.

@@            Coverage Diff             @@
##             main     #808      +/-   ##
==========================================
- Coverage   65.42%   65.10%   -0.32%     
==========================================
  Files          59       59              
  Lines        7979     8022      +43     
  Branches     1410     1415       +5     
==========================================
+ Hits         5220     5223       +3     
- Misses       2750     2790      +40     
  Partials        9        9              

Impacted Files	Coverage Δ
packages/core/src/contrib/Functions.ts	32.38% <0.00%> (-1.36%)	⬇️
packages/core/src/contrib/Objectives.ts	50.00% <0.00%> (-0.99%)	⬇️
packages/core/src/contrib/ConstraintsUtils.ts	57.03% <7.14%> (-6.13%)	⬇️
packages/core/src/contrib/Constraints.ts	65.09% <42.85%> (-1.91%)	⬇️
packages/core/src/engine/Autodiff.ts	54.83% <42.85%> (-0.18%)	⬇️

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