Add project option to allow boot splash disabling at editor startup

[Chaosus]

Added new option "Use At Editor Startup" to boot splash settings which allows disabling it and use the default one when the project has been loading, but not when the game actually runs. Its true by default so users could manually disable it for their projects. I tried EDITOR_DEF to allow it globally but it crashes(editor settings seems to be not fully loaded at the stage of project loading). Its my attempt to fix #22073.

[Calinou]

Does this need to be an option? I can't see any use cases for displaying the project splash screen when editing the project.

We have a lot of project/editor settings already, adding more of them needs to be justified.

[erodozer]

I don't know if this is an ok thing to have considering some patreon supporters pay big bucks to be included on the engine splash screen.

[Calinou]

I don't know if this is an ok thing to have considering some patreon supporters pay big bucks to be included on the engine splash screen.

It's already possible to disable the custom editor splash screen by recompiling the engine with the no_editor_splash=yes option 🙂

[Chaosus]

Yeah, its not a useful option, if this is not desirable then what about closing #22073 also ?

[Chaosus]

Its useless decorative option which overcomplicate the engine, so I better close it.