Converts the messy e-prime data file into a tidy raw data file that is easy to work with.
raw_symspan(x, include_col = c(), taskVersion = "new")dataframe
c(): list of additional columns to include
old or new version. Required for different types of data files from older or newer versions of the complex-span tasks. First leave out the argument, if it does not work then try taskVersion = "old".