Add support for option number-format of fn:parse-json

[GuntherRademacher]

These changes add support for option number-format to

• fn:parse-json
• fn:json-doc
• json:parse

It replaces option number-parser for these functions. number-parser continues to be supported for fn:json-to-xml.

All of these options are defined in JsonParserOptions, though the allowances are different for different functions (this was even the case before these changes with option null). Upon invocation, there is an extra check for the option being supported with the particular format, but as it is now, it can only trigger an error upon non-default-values.

There are 14 QT4 test cases using number-parser for fn:parse-json and fn:json-doc, which are now failing because number-parser is rejected.

[ChristianGruen]

…perfect.