move random to namespace ext

alib2algo/src/automaton/generate/RandomAutomatonFactory.cpp

alib2algo/src/common/Permutation.hpp

alib2algo/src/grammar/generate/RandomGrammarFactory.cpp

alib2algo/src/regexp/generate/RandomRegExpFactory.cpp

alib2algo/src/string/generate/RandomStringFactory.cpp

alib2algo/src/string/generate/RandomSubstringFactory.h

alib2algo/src/tree/generate/RandomTreeFactory.cpp

...go_experimental/src/graph/generate/RandomGraphFactory.cpp

...measurepp/src/provisioner/MeasurementProvisionerUtils.cpp

alib2std/src/extensions/init.cpp

alib2std/src/extensions/random.cpp

alib2std/src/extensions/random.hpp

alib2std/test-src/extensions/RandomTest.cpp

arand2/src/arand.cpp