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Add comment about using streaming version of base64

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