evalFuture(): Add argument 'context'; dropped 'strategiesR' and 'thre… #411

Job	Run time
future.batchtools (release)	4m 25s
future.callr (release)	3m 43s
doFuture (release)	3m 27s
future.apply (release)	3m 56s
furrr (release)	3m 57s
doFuture (release) multisession	3m 42s
future.apply (release) multisession	4m 34s
furrr (release) multisession	3m 59s
future.apply (release) keepWhere	4m 13s
future.apply (release) !keepWhere	3m 55s
	39m 51s

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