CarpetX: make driver.hxx, schedule.hxx and timer.hxx visible to other… #204

Job	Run time
download-build-test (cpu, real32, debug)	12m 17s
download-build-test (cpu, real64, debug)	12m 38s
download-build-test (cpu, real64, optimize)	18m 20s
download-build-test (cuda, real32, debug)	23m 45s
download-build-test (cuda, real64, debug)	24m 1s
download-build-test (cuda, real64, optimize)	24m 5s
download-build-test (rocm, real64, optimize)	20m 26s
	2h 15m 32s

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