use url.PathUnescape to print some urls

[kamilsk]

use option to define this behavior.

For example

https://howilive.ru/goto?url=https://ru.wikipedia.org/wiki/%d0%a4%d0%be%d0%bd%d0%b4_%d1%81%d0%b2%d0%be%d0%b1%d0%be%d0%b4%d0%bd%d0%be%d0%b3%d0%be_%d0%bf%d1%80%d0%be%d0%b3%d1%80%d0%b0%d0%bc%d0%bc%d0%bd%d0%be%d0%b3%d0%be_%d0%be%d0%b1%d0%b5%d1%81%d0%bf%d0%b5%d1%87%d0%b5%d0%bd%d0%b8%d1%8f -> https://howilive.ru/goto?url=https://ru.wikipedia.org/wiki/Фонд_свободного_программного_обеспечения

[kamilsk]

also add option "colorize"