CE improvements, some docs

[kMutagene]

this PR

• adds match cases for Option (JsonArray, Object, Value, Node) to the parseAny function. the main reason is i want to be able to do this:

  let myOptionalObject = Some (object {property "key" "value"})
  object {
  property "optional" (-. myOptionalObject  )
  }

• changes optional -> optionalObject and optionaL -> optionalArray to make it more clear how to use them:

  object {
    property "willFail" (object {
      optionalObject
      property "" (+. Option.None)
  }) // will return {}
  
  object {
    property "willFail" (array {
        yield optionalArray
        yield (+. Option.None)
    }) // will return {}

• changes required -> requiredObject and requireD -> requiredArray to make it more clear how to use them:

  object {
    property "willFail" (object {
      requiredObject
      property "" (+. Option.None)
  }) // will fail
  
  object {
    property "willFail" (array {
        yield optionalArray
        yield (+. Option.None)
    }) // will fail

• adds some more FSharpExtensions for JsonNodes, including some refactoring of existing functions

• adds tests

• adds some readme documentation