Add local file loading capability
Add local file loading capability

This will be used in implementation of #3438.

brok85/cgeo,kumy/cgeo,xiaoyanit/cgeo,samueltardieu/cgeo,auricgoldfinger/cgeo,tobiasge/cgeo,vishwakulkarni/cgeo,SammysHP/cgeo,auricgoldfinger/cgeo,SammysHP/cgeo,S-Bartfast/cgeo,cgeo/cgeo,yummy222/cgeo,lewurm/cgeo,Huertix/cgeo,xiaoyanit/cgeo,kumy/cgeo,pstorch/cgeo,vishwakulkarni/cgeo,cgeo/cgeo,matej116/cgeo,ThibaultR/cgeo,pstorch/cgeo,yummy222/cgeo,cgeo/cgeo,superspindel/cgeo,superspindel/cgeo,marco-dev/c-geo-opensource,Huertix/cgeo,mucek4/cgeo,madankb/cgeo,mucek4/cgeo,rsudev/c-geo-opensource,KublaikhanGeek/cgeo,schwabe/cgeo,marco-dev/c-geo-opensource,Huertix/cgeo,superspindel/cgeo,KublaikhanGeek/cgeo,Bananeweizen/cgeo,vishwakulkarni/cgeo,kumy/cgeo,auricgoldfinger/cgeo,samueltardieu/cgeo,madankb/cgeo,cgeo/cgeo,pstorch/cgeo,lewurm/cgeo,SammysHP/cgeo,lewurm/cgeo,ThibaultR/cgeo,marco-dev/c-geo-opensource,madankb/cgeo,rsudev/c-geo-opensource,xiaoyanit/cgeo,schwabe/cgeo,ThibaultR/cgeo,KublaikhanGeek/cgeo,mucek4/cgeo,schwabe/cgeo,S-Bartfast/cgeo,rsudev/c-geo-opensource,Bananeweizen/cgeo,Bananeweizen/cgeo,brok85/cgeo,matej116/cgeo,tobiasge/cgeo,tobiasge/cgeo,brok85/cgeo,yummy222/cgeo,matej116/cgeo,schwabe/cgeo,S-Bartfast/cgeo,samueltardieu/cgeo