Redesign to match f# naming conventions

[wallymathieu]

Description

FSharpx provides a lot of functionality, but there is some need to trim it and apply .net and f# naming conventions.

See also:
#311
#325
#368

Some of the modules clashes with System types and causes problems for c#.

Repro steps

Note for instance that the following does not compile:

String.Join(" ",Strings.splitBy(c=>c== '?' || c=='!', "Hello?World?fsharpx"));

Expected behavior

Following how it's done in f# core, I would expect the below to compile:

String.Join(" ",Strings.SplitBy(c=>c== '?' || c=='!', "Hello?World?fsharpx"));

It could also be nice to be able to do the following:

Enums.TryParse<LanguageOptions>("English")

Lenses are useful in c# as well. Being able to create and compose f#x lenses would be a nice thing.

Some of the modules could simply be pluralized in order to avoid c# type system issues.

[wallymathieu]

Anything I've missed @smoothdeveloper?

[wallymathieu]

Ping @panesofglass

[gdziadkiewicz]

IMO it would be a good idea to decide on a solution, implement it and release in 3.0.0 if breaking changes will be necessary.