remove quotes from extracted font-family

[mvachette]

closes #176

I did the modification on branch 4.6 because this is the version i use. I can edit my PR to target another branch, depending of your version policy.

[spipu]

you forget others chars, like \t, \n, ...

i think the best way is to use lines, to use the original trim default value

                    $val = trim($val[0]);
                    $val = trim($val, '\'"');

can you update your PR ?

i will add it directly on the master branch

[spipu]

i close this PR. The 4.6 branch is not deprecated