Add setSilent() method to URI class

[michalsn]

Description
Using $uri->setSilent() method will disable throwing exceptions. May be handy for using with methods like $uri->getSegment().

Ref: #2952, #2949

Checklist:

• Securely signed commits
• Component(s) with PHPdocs
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide