#370 cannot find plugins when path contains spaces

[Terry O'Neill]

When Xena is run from a directory other than the directory of the xena.jar file and the path to the xena.jar file contains spaces then Xena will not find the plugins directory.

It appears the logic is that Xena looks for a plugins directory in the current directory first and then if that does not work it tries to find the directory of xena.jar and then if there is a plugins directory in the same directory. However this uses URL type logic which translates spaces into %20 which prevents it from finding the plugins directory if there are spaces in the path.