Added the directory of the current executable to the plug-in search path, to enable running from the tests directory.
Added the directory of the current executable to the plug-in search path, to enable running from the tests directory.

acmorrow/pion-core,acmorrow/pion-core,acmorrow/pion-core,acmorrow/pion-core,acmorrow/pion-core,acmorrow/pion-core,acmorrow/pion-core