Two old system upgrade bugs

[Rinart73]

Since devs are saying that the next update will be about system upgrades, I decided to remind about two old and annoying bugs related to the upgrades. Both of these bugs are present on all recent Avorion versions.

 

[*]You can perfectly fine install/uninstall upgrades via right click, but when a player drags them into/out of the slot, game sometimes fails to attach/unattach script. This will result in "Object Detectors" not highlighting asteroids, no "Trading module" icon e.t.c. Or you can drag out the "Trading module" upgrade and still have it's icon (and thus the attached script).

[*]Occasionally UI 'hides' installed upgrades icons so their slots look like no upgrade is installed. Can't find a way to reproduce it though.