v2021-05-27

Reduce runtime expenses with specialized implementations of blobs

+ Adapt internal representations of blob values and related parts of the program to reduce processing times. Find a representation that allows for more efficient processing while maintaining interfaces making accidental mutation less likely.
+ Adapt the `FileStore` interfaces to use the same type for blobs.
+ Specialize composition hash function to reduce runtime expenses.
+ Avoid confused method reference resolution in Elm Editor: Disable the automated test depending on Elm Editor until we have linked the new assembly from CI build.