Fix Resource collection to allow fetching of classes given a base class

[chances]

• Add Resources.hasChanged function

[codecov]

Codecov Report

Merging #33 (e12cdf2) into master (b18226e) will increase coverage by 0.68%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #33      +/-   ##
==========================================
+ Coverage   32.10%   32.78%   +0.68%     
==========================================
  Files          17       17              
  Lines        1520     1528       +8     
==========================================
+ Hits          488      501      +13     
+ Misses       1032     1027       -5     

Impacted Files	Coverage Δ
source/teraflop/ecs.d	91.24% <100.00%> (+2.72%)	⬆️

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