Address some transform-related naming inconsistencies

[oschulz]

We forgot a few additional types and functions when we renamed vartransform to transport_to during the course of #62. This renames them to make things more consistent:

• Rename VarTransformation to TransportFunction
• Rename test_vartransform to test_transport
• Rename NoVarTransform to NoTransport
• Rename checked_var to checked_arg
• Rename NoVarCheck to NoArgCheck
• Rename internal transport helper functions

[github-actions]

Package name	latest	stable
MeasureTheory.jl

[codecov]

Codecov Report

Merging #63 (90c88f6) into master (648376d) will not change coverage.
The diff coverage is 71.11%.

@@           Coverage Diff           @@
##           master      #63   +/-   ##
=======================================
  Coverage   47.55%   47.55%           
=======================================
  Files          37       37           
  Lines         942      942           
=======================================
  Hits          448      448           
  Misses        494      494           

Impacted Files	Coverage Δ
src/transport.jl	63.88% <62.50%> (ø)
src/getdof.jl	87.50% <80.00%> (ø)
src/combinators/power.jl	84.90% <100.00%> (ø)
src/combinators/transformedmeasure.jl	71.42% <100.00%> (ø)
src/interface.jl	96.29% <100.00%> (ø)
src/primitives/dirac.jl	70.58% <100.00%> (ø)
src/primitives/lebesgue.jl	80.95% <100.00%> (ø)

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[oschulz]

Most names changes are straightforward, I think. I'm not sure about checked_var - I rename it to checked_arg here, but maybe that could also be misunderstood? Would checked_variate be better?

[cscherrer]

If it's not very user facing, how about check_support_type?

[mschauer]

I am happy with checked_arg

[oschulz]

If it's not very user facing, how about check_support_type?

It doesn't just check the type, it can also check the size of arrays, etc.

[oschulz]

Are you happy with the state of this @cscherrer ?

[cscherrer]

@oschulz is this a minor or patch release?

[oschulz]

@oschulz is this a minor or patch release?

It'll have to be v0.12, some of these things have docstrings. So probably best to fix these naming inconsistencies now, I'd say.

[oschulz]

Ok, if I go ahead and tag this v0.12 and release it?

[github-actions]

Package name	latest	stable
MeasureTheory.jl