* Proposed fix for https://github.com/earwig/mwparserfromhell/issues/197
* Port the fix for #197 to the C tokenizer
* Fix parsing of external links where the URL is terminated by some special character
- One existing test case has been found wrong -- current MediaWiki
version always terminates the URL when an opening bracket is
encountered.
- Other test cases added: double quote, two single quotes and angles
always terminate the URL (regardless if it is a free link or external
link inside brackets). One single quote does not terminate the URL.
* Fix case-insensitive parsing of URI schemes