Fix windows-only paths in project.properties
Fix windows-only paths in project.properties

kumy/cgeo,cgeo/cgeo,Bananeweizen/cgeo,kumy/cgeo,rsudev/c-geo-opensource,auricgoldfinger/cgeo,pstorch/cgeo,pstorch/cgeo,S-Bartfast/cgeo,S-Bartfast/cgeo,matej116/cgeo,tobiasge/cgeo,auricgoldfinger/cgeo,Bananeweizen/cgeo,cgeo/cgeo,superspindel/cgeo,pstorch/cgeo,rsudev/c-geo-opensource,S-Bartfast/cgeo,superspindel/cgeo,rsudev/c-geo-opensource,matej116/cgeo,mucek4/cgeo,cgeo/cgeo,mucek4/cgeo,matej116/cgeo,kumy/cgeo,auricgoldfinger/cgeo,superspindel/cgeo,tobiasge/cgeo,cgeo/cgeo,Bananeweizen/cgeo,mucek4/cgeo,tobiasge/cgeo