helper Icons on instances in the room editor

[iampremo]

[Ticket #193649]

Feature Type: feat_addition_ide Description: Add some helper icons/indicators on selected (or maybe all?) instances to indicate the following:

• the instance has creation code
• the instance has it's default variable definitions changed
• the instance is locked (the selection color change is decent, but a floating icon might fit well with the above)
• (a little bit of a bigger ask) lines pointing to other instances referenced in variable definitions.

Ideally, these indicators in the room editor on the actual instances (and could be toggled on/off the toolbar) Optional warnings to prevent deletion of an instance with creation code would also be a nice add. Benefit: When there are a lot of objects with specific settings in a room, having some sort of indicators like these would help identify which object is doing what at a glance. The room editor is nice, but I feel it lacks some visual tools to help create complex logic in the editor. Link:

[gnysek]

Same for instances in object properties IMO.

[Alphish]

When it comes to the last of these (lines pointing to other instances referenced in variable definitions), this would work nicely with this suggestion: https://github.com/YoYoGames/GameMaker-Bugs/issues/3324

If the last of these was implemented, I'd like it to be separately toggle-able, so that I could show/hide the web of links at will. The other three aren't as intrusive, in that they stick close to the instance.

[gnysek]

Indicating overriden properties in object editor: in room editor: