Highlighter: Remove hardcoded colors in doxygen.
Highlighter: Remove hardcoded colors in doxygen.

Use colors from the creator settings instead.

Task-number: QTCREATORBUG-12420
Change-Id: I477d16420a6e5d99551bb132da71ab5b28a3ff78
Reviewed-by: Eike Ziller <c142da16c73a95a82d35191bcc55b22835617128@digia.com>
Reviewed-by: Christian Stenger <accbb51712d7b9c4fb108439d01e716148e5f9e6@digia.com>

xianian/qt-creator,xianian/qt-creator,danimo/qt-creator,farseerri/git_code,farseerri/git_code,farseerri/git_code,AltarBeastiful/qt-creator,danimo/qt-creator,xianian/qt-creator,kuba1/qtcreator,kuba1/qtcreator,danimo/qt-creator,maui-packages/qt-creator,martyone/sailfish-qtcreator,amyvmiwei/qt-creator,danimo/qt-creator,Distrotech/qtcreator,amyvmiwei/qt-creator,amyvmiwei/qt-creator,AltarBeastiful/qt-creator,danimo/qt-creator,kuba1/qtcreator,kuba1/qtcreator,Distrotech/qtcreator,farseerri/git_code,Distrotech/qtcreator,AltarBeastiful/qt-creator,xianian/qt-creator,kuba1/qtcreator,martyone/sailfish-qtcreator,amyvmiwei/qt-creator,amyvmiwei/qt-creator,kuba1/qtcreator,maui-packages/qt-creator,maui-packages/qt-creator,martyone/sailfish-qtcreator,kuba1/qtcreator,xianian/qt-creator,farseerri/git_code,martyone/sailfish-qtcreator,danimo/qt-creator,amyvmiwei/qt-creator,AltarBeastiful/qt-creator,AltarBeastiful/qt-creator,danimo/qt-creator,farseerri/git_code,maui-packages/qt-creator,martyone/sailfish-qtcreator,amyvmiwei/qt-creator,farseerri/git_code,martyone/sailfish-qtcreator,AltarBeastiful/qt-creator,danimo/qt-creator,Distrotech/qtcreator,danimo/qt-creator,xianian/qt-creator,maui-packages/qt-creator,xianian/qt-creator,xianian/qt-creator,maui-packages/qt-creator,Distrotech/qtcreator,martyone/sailfish-qtcreator,martyone/sailfish-qtcreator,AltarBeastiful/qt-creator,kuba1/qtcreator,xianian/qt-creator,maui-packages/qt-creator,kuba1/qtcreator,Distrotech/qtcreator,Distrotech/qtcreator,martyone/sailfish-qtcreator,farseerri/git_code,AltarBeastiful/qt-creator,amyvmiwei/qt-creator