Make scrolloff and sidescrolloff global-local #279

Job	Run time
macos (tiny)	1m 34s
macos (normal)	10m 13s
macos (huge)	15m 43s
windows (HUGE, msvc, no, no, x64)	9m 51s
windows (HUGE, mingw, yes, yes, x86, yes)	12m 59s
windows (HUGE, msvc, no, yes, x86)	12m 12s
windows (HUGE, mingw, yes, no, x64, yes)	14m 6s
windows (NORMAL, msvc, yes, no, x86)	10m 38s
windows (NORMAL, mingw, no, yes, x64)	10m 34s
windows (TINY, msvc, yes, yes, x64)	3m 29s
windows (TINY, mingw, no, no, x86)	5m 11s
linux (tiny, clang, none)	2m 28s
linux (tiny, gcc, none)	1m 28s
linux (normal, clang, none)	8m 16s
linux (normal, gcc, none)	9m 0s
linux (huge, clang, none)	8m 1s
linux (huge, gcc, none)	14m 12s
linux (tiny, clang, nogui)	1m 27s
linux (tiny, gcc, nogui)	1m 49s
linux (huge, gcc, testgui, true, true)	22m 9s
linux (huge, clang, asan)	23m 5s
linux (huge, gcc, unittests, true)	2m 24s
linux (normal, gcc, vimtags)	1m 29s
	3h 22m 18s

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