Redvox

* Updated automatic file writing functions to use temporary directory when available memory is insufficient
* Updated json loading functions
* Updated json writing functions
* Fixed various bugs when saving and loading data to disk

* Updated functions in EventStream
* functions string_data, numeric_data, boolean_data and byte_data are renamed to
get_string_values, get_numeric_values, get_boolean_values and get_byte_values respectively
* functions get_string_channel, get_numeric_channel, get_boolean_channel and get_byte_channel
are renamed to get_string_column, get_numeric_column, get_boolean_column and get_byte_column respectively
* removed the word data from functions data_timestamps and unaltered_data_timestamps

* Events added to Stations
* Updated methods used to create Stations
* Fixed bugs when creating DataWindows, Stations, and Sensors

* Write SensorData to disk instead of saving in memory

* Docs updated
* Config property of DataWindow changed to function
* out_dir parameter of DataWindow changed to output_dir

* Fixed missing values when loading Health Sensor data