FIX finish conversion to URLEncoded for URIs and UTF-8 support.

core/http/src/handlers/handler.rs

core/http/src/handling/request/form_utils.rs

core/http/src/handling/response/cookie_management/cookie.rs

...src/handling/response/cookie_management/cookie_builder.rs

core/http/src/handling/response/datatypes.rs

core/http/src/handling/response/response.rs

core/http/src/utils/urlencoded/datatypes.rs

core/http/src/utils/urlencoded/endecode.rs

site/src/main.rs