add timeout keyword to set-option in the smt2 frontend #499

Job	Run time
ubuntu-latest\|debug\|--enable-mcsat\|CC=gcc CXX=g++	8m 38s
ubuntu-latest\|debug\|--enable-mcsat\|CC=clang CXX=clang++	10m 1s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=gcc CXX=g++	4m 29s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=clang CXX=clang++	4m 52s
ubuntu-latest\|release\|--enable-mcsat\|CC=gcc CXX=g++	5m 41s
ubuntu-latest\|release\|--enable-mcsat\|CC=clang CXX=clang++	6m 10s
ubuntu-latest\|release\|--enable-thread-safety\|CC=gcc CXX=g++	2m 54s
ubuntu-latest\|release\|--enable-thread-safety\|CC=clang CXX=clang++	3m 13s
ubuntu-latest\|gcov\|--enable-mcsat\|CC=gcc CXX=g++	8m 46s
ubuntu-latest\|debug\|--enable-thread-safety --enable-mcsat\|CC=gcc CXX=g++	8m 52s
	1h 3m 36s

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