Add Dataref type and writability in the drt_last_run_datarefs.txt file.

[ChrisInUT]

Please add the dataref type (e.g. string, int, float, float[x]) and writability in the drt_last_run_datarefs.txt file using a tab delimiter? This will allow users to easily understand the variables for a given aircraft without having the sim running. The tab delimiter will allow for easy copy and paste into Excel or Google Sheets for use and searchability offline. Thanks.