Use different icons for revertable instanced properties in the inspector

[Calinou]

Properties modified from their default value (but otherwise unmodified from the instanced/inherited scene) will display a non-clickable asterisk icon as well.

This closes godotengine/godot-proposals#2581.

Some questions:

• Should the instanced revert icon have a different icon color? It's not that easy to distinguish at a glance right now. I made it have a "dashed" appearance to mimic the PackedScene's "movie clap" icon.
• Should the asterisk icon be slightly faded out? It can't be clicked after all (I already disabled the hover feedback for it).

Preview

Base scene

Inherited scene

Flip H was manually unchecked.

[YeldhamDev]

I like the asterisk one, but the new reload icon looks too detailed for its size, and kinda ugly as a result.

[groud]

I am not strictly against a change here, but do we really need to make a distinction between "real default values" and "default values by inheritance"? I am not sure I understand problem to solve behind this. For me, the "revert to default value" simply mean reverting to the inherited class default value, so the distinction between the two does not seem very necessary.

Maybe another solution might be to simply find a way to notify that a property was modified in the hierarchy. Like by changing the font color to red or something like that? That's more or less what the asterisk does but in a more subtle way I guess?

[reduz]

I understand the good intention here but I think this is bad usability. The revert icon works very well even if you cant distinguish between scenarios. Changing this will make it worse for more people than those who it helps.

[Calinou]

Closing due to lack of support.