[Editor] Make foreground flashing to show where is a searching item

[Wohlstand]

When searching elements on level or on world map, it's need to also show some sort of flashing animation which makes easier way to see where finding element is hiding (busy scene places, or places under other foreground objects are making element totally invisible for us).

Related discussion from the Discord

@Hoeloe Urgh the search objects in level feature is so awful! I wish it like highlighted where the things it found are.

@Wohlstand What trouble you have with it? It does highlight (by selection set) and camera scroll to the place where searching object is.

@Hoeloe The trouble, wohl, is that the selection borders don't stand out. They're fine for showing something's selected if you just clicked it. But if you're trying to find a small dotted line in a busy scene it can be really difficult.

@Wohlstand Then, needs to add some sort of animation that helps to point where the body is located.

@Hoeloe If it were me I'd make a gently flashing box around the object that disappears on the next click.

@Wohlstand Anyway, I may guess, the trouble will also appear when necessary object is hidden under something other (like foreground BGO).

@Hoeloe Yes! Which is why a flashing marker would help.