Patches to CRAN release

This release adds some important bug-fixes, and support for new dependent-variables.

You should update to this release from the CRAN release, as there should be no problems with backwards compatibility, and it fixes some major bugs.

We'll be adding this version to CRAN soon.

Changes:

• Important bug-fix in clean_by_trackloss. Previously did not work for certain column names.
• Important bug-fix in make_eyetrackingr_data. Previously did not work correctly with treat_non_aoi_as_missing = TRUE.
• Can specify any arbitrary dependent-variable for make_time_window_data or make_time_sequence_data to summarize. This DV can then be plotted and used in downstream functions (like analyze_time_bins or make_time_cluster_data)
• Bug-fix in error/warning reporting in analyze_time_bins and functions that call this (e.g make_time_cluster_data).