SimObject Display Engine versions

v1.5 [Jun 6, 2017]
- PlatformManager: Fixed Registry key handling when trailing backslash was missing.
- General: Fixed aircraft.cfg parsing when a comment is present on the same line.
- General: Main object injection loop is now protected from interrupts from the seasonal data update. This fixes double injections of the same object.
- DensityAltitudeDisplay: Output is now rounded to the next multiplier of 10.
- Radio-Controlled Objects: Grouped SimObjects with common radio-controlled visibility are now correctly handled.