Jira images attributes as in `!image.jpg|align=right!` are retained as
key-value pairs. Thumbnail images, such as `!example.gif|thumbnail!`,
are marked by a `thumbnail` class in their attributes.
Related to #6234.
A bug was fixed which caused faulty parsing if a table was not preceded
by a newline and the first table cell had no space after the initial `|`
characters.
Fixes: #6198
A bug was fixed which caused non-emphasized text containing digits and/or
non-special symbols (like dots) to sometimes be parsed incorrectly.
Fixes: #6196
* Support for colored inlines has been added.
* Lists are now allowed to be indented; i.e., lists are still recognized
if list markers are preceded by spaces.
Closes: #6183, #6184
