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Add explanation of isMorePrecise for fixed-points, rename M0 into REAL and remove unused import from Expressions.v

Refactor error computation in semantics into separate function/Proposition
to be able to differentiate between truncation and rounding-to-nearest error.

Refactor exp type into expr type because of name clash with new coq version, move ExpOrderedType module into separate file

Using this new typing, prove the stronger soundness statement, moving the evaluation to the conclusion of the theorems.

I also simplified the double pattern matchings used in Expressions.v

Typing of expressions is done. However, there are still some admits in the proofs, to be fixed in the following days.

/ ! \ not compiling

Remove currently unused dependency on cakeml which came from merging with translation branch
Remove currently unu

/!\ Does not compile