Allow button widget vars and fix radio groups

[ghost]

closes #1647

[codecov]

Codecov Report

Merging #1652 (57b8e5b) into master (46be551) will decrease coverage by 0.01%.
The diff coverage is n/a.

❗ Current head 57b8e5b differs from pull request most recent head 27e38ac. Consider uploading reports for the commit 27e38ac to get more accurate results

@@            Coverage Diff             @@
##           master    #1652      +/-   ##
==========================================
- Coverage   77.87%   77.86%   -0.02%     
==========================================
  Files         234      234              
  Lines       18156    18165       +9     
==========================================
+ Hits        14139    14144       +5     
- Misses       4017     4021       +4     

Impacted Files	Coverage Δ
lib/cosmos/microservices/reducer_microservice.rb	91.39% <0.00%> (-1.23%)	⬇️
lib/cosmos/topics/command_topic.rb	100.00% <0.00%> (ø)
lib/cosmos/microservices/interface_microservice.rb	64.83% <0.00%> (ø)
lib/cosmos/top_level.rb	84.25% <0.00%> (+0.18%)	⬆️
lib/cosmos/utilities/s3_file_cache.rb	23.12% <0.00%> (+0.21%)	⬆️

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