* PLT-3552 Partially-fixed an invalid test case
* PLT-3551 Removed an invalid test case
* PLT-3482 Added a test case for multiple lists separated by text
* PLT-3482 Updated marked to fix multiple lists separated by text
* Removed MattermostLexer since it was exactly the same as the default marked one
* Updated list autonumbering to always start numbering from the first item's number