Update trac plugins section on wiki

[strk]

The current list of Trac plugins, according to pip list -v | grep Trac is this:

Package                       Version    Location                                                                   Installer
----------------------------- ---------- -------------------------------------------------------------------------- ---------
TracCrystalXTheme             1.1        /usr/local/lib/python2.7/dist-packages                                     pip
TracDoxygen                   0.7.6.dev0 /usr/local/lib/python2.7/dist-packages                                     pip
TracGamedevTheme              2.0        /usr/local/lib/python2.7/dist-packages                                     pip
TracLDAPEmailResolver         0.1        /usr/local/lib/python2.7/dist-packages/TracLDAPEmailResolver-0.1-py2.7.egg
TracpathTheme                 1.0.2      /usr/local/lib/python2.7/dist-packages                                     pip
TracSectionEditPlugin         1.3.0      /usr/local/lib/python2.7/dist-packages                                     pip
TracSpamFilter                1.2.2.dev0 /usr/local/lib/python2.7/dist-packages/TracSpamFilter-1.2.2dev-py2.7.egg
TracStats                     0.6.1      /usr/local/lib/python2.7/dist-packages
TracTags                      0.12.1     /usr/local/lib/python2.7/dist-packages                                     pip
TracThemeEngine               2.3.1      /usr/local/lib/python2.7/dist-packages                                     pip
TracTocMacro                  11.0.0.7   /usr/local/lib/python2.7/dist-packages/TracTocMacro-11.0.0.7-py2.7.egg
TracTweakTheme                0.1.0      /usr/local/lib/python2.7/dist-packages                                     pip
TracWikiExtras                1.3.2.dev0 /usr/local/lib/python2.7/dist-packages                                     pip

Those are 13 plugins whereas the wiki only lists 6 as being active: ​https://wiki.osgeo.org/wiki/Trac#Plugins

It would be useful to have an up to date view on the matter as it is important during upgrades to evaluate compatibilities.

[strk]

Additional plugins that are in use (but don't contain the Trac substring in their names):

Package                       Version    Location                                                                   Installer
----------------------------- ---------- -------------------------------------------------------------------------- ---------
BlueFlatTheme                 1.1.0.dev0 /usr/local/lib/python2.7/dist-packages                                     pip
BasicThemeEditorPlugin        0.1        /usr/local/lib/python2.7/dist-packages                                     pip

[strk]

I've updated the wiki section.