Improve Particle node defaults when created in the editor

[Calinou]

• Depends on Add object_created_in_editor signal #122058.
• Follow-up to Improve Decal node defaults when created in the editor for better usability #122066 (can be merged independently).

This aims to improve the particle system's usability by setting sensible defaults automatically. This should greatly reduce the number of clicks required to achieve a fully functional particle setup (with scale, color and flipbook animation support).

For compatibility reasons, Particles created via code or in older versions of Godot are not affected.

Compared to the proposal, this makes a few changes to the default setup:

• Enable random initial particle angle to reduce visible repetition.
• Use a square texture shape, so that particle rotation can be discerned.
• Reduce texture size to 12×12, so that the size in 2D (which depends on texture size) is mostly consistent with the size in 3D.

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• This closes Automatically assign a default particle setup to newly created GPUParticles/CPUParticles nodes in the editor godot-proposals#15317.

Testing project: test_particles_created_in_editor.zip

Preview

particle_created_in_editor.mp4

particle_created_in_2d_editor.mp4

particle_created_in_3d_editor.mp4