Asynchronous determination of caches to refresh
Asynchronous determination of caches to refresh

Work on #5533.

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