Always take the user to a new window when clicking off site links
Always take the user to a new window when clicking off site links

Original caused GitHub contributor credits screen to open in the active
page of the ElkArte site. That usually irritates most users. So, now
they get a new window to view the contributor list in.

elkarte/Elkarte,StealthWombat/How-to-fork-an-Elk,StealthWombat/How-to-fork-an-Elk,interlab/Elkarte,emanuele45/Dialogo,wizardaf/Elkarte,wizardaf/Elkarte,Spuds/Elkarte,Ant59/Elkarte,wizardaf/Elkarte,nwsw/Elkarte,elkarte/Elkarte,nwsw/Elkarte,joshuaadickerson/Elkarte2,Ant59/Elkarte,emanuele45/Dialogo,Ant59/Elkarte,interlab/Elkarte,nwsw/Elkarte,emanuele45/Dialogo,interlab/Elkarte,Spuds/Elkarte,wizardaf/Elkarte,joshuaadickerson/Elkarte2,joshuaadickerson/Elkarte2,Spuds/Elkarte,elkarte/Elkarte,joshuaadickerson/Elkarte2,StealthWombat/How-to-fork-an-Elk,StealthWombat/How-to-fork-an-Elk