MapWidget: Set deleted variable to null for properness
Code Cleanup: Added error checking to Log Download filename changes, and set an pointer to null after deletion
Graphing: Added export button to export a loaded .bin file to a .log file, beginning of a fix for #395
Logging: Fix #397, TLogs not being generated, and added option to enable/disable logging in the Config window
Graphing: Fix #396, QVariants use both floats, and doubles
Graphing: Fix #388, grid view getting out of sync with hide checkbox