Percent encoding and Punycode support for plain URLs

[mkykadir]

Fixes #2618 and Fixes #492

Now plain http://hello-🌍.com/🖐 input is valid for URL
Note: Variable names are chosen to match with pseudo-codes in RFC3492

• Ctor for string input of URL is extended with boolean parameter which specifies if string is already an encoded input (default)
• parsePlain static method is added to parse plain inputs
• Path, query and achor is percent encoded for plain inputs
• Subdomains and domain are puny encoded for plain inputs

[Geod24]

Need to read the spec, did a first pass for obvious things.

[Geod24]

LGTM. Just fix the commit and rebase, and will merge.