filter_times.eyer: Filters data between start and end time
In hejtmy/EyeR: Loading and preprocessing of eyetrakcer data

Filters data between start and end time

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## S3 method for class 'eyer'
filter_times(obj, times, data_fields = c(),
  raw_times = FALSE, recalculate_times = FALSE)

`obj`	Eyer object to filted data from
`times`	is a dataframe or a numeric(2) start and end to filter parts of the eyetracking. If it is set, start and end are ignored
`data_fields`	list of data fields (in obj$data) to filter. If empty, all fields are filtered
`raw_times`	if TRUE, uses obj$info$start_time to calculate times to filter. Useful if the data have 0 based times since start, but we want to filter based on other values.
`recalculate_times`	If true, recalculates times to begin at 0 again. Changes obj$info$start_time.