Mimetype may contain a parameters.
Then, the mimetype would be something like "text/html;foo=bar;foz=baz"
It will contains a `;` and `=` and it conflicts with the same operators
we use to separate the items in our list.
We have to use a more advanced algorithm which takes the context into
account.
Fix#416
The `common` name is from the time where kiwix was only one repository
for all the project (android, desktop, server...).
Now we have split the repositories and kiwix-lib is the "common" repo,
the "common" directory is somehow nonsense.
Veloman Yunkan
Matthieu Gautier