Issue #2752961 by dawehner, Wim Leers, Jo Fitzgerald, bradjones1, chr.fritsch,...

Issue #2752961 by dawehner, Wim Leers, Jo Fitzgerald, bradjones1, chr.fritsch, greg.1.anderson, anavarre, Berdir, moshe weitzman, bkosborne, alexpott, Crell, catch, msonnabaum, lauriii, joelpittet, deviantintegral, cilefen, effulgentsia, xjm: No reliable method exists for clearing the Twig cache