remove magic trimming of URI component delimiters

[Tobion]

This PR is based on #81 and will be rebased when #81 is merged.

• unify wrong type handling for uri components: withHost didn't check the type for example, but withPath did. And withQuery checked for __toString which is not specified in PSR-7.
• remove magic trimming of component delimiters which is not according to PSR-7. This magic has been removed in [PSR-7] UriInterface: rootless path, delimiters, consistency php-fig/fig-standards#503
• add missing lowercase normalization for host
• improve encoding tests
• use possessive quantifier to encode uri (++) to prevent regex backtracking which improves performance

[mtdowling]

The other PR is merged. Can you rebase?

[Tobion]

Done

[Tobion]

@mtdowling ping