Allow Editor to use non-preloaded scripts

[LeXXik]

Often it is beneficial not to preload all assets in the beginning, including the scripts. However, if the script is set to not preload in Editor, it cannot be used (i.e. cannot change script attributes). This is a feature request to allow Editor to use scripts that have their preload checkbox disabled:

[marklundin]

Could you provide a repro? You should be able to set a script not to preload and see the attributes parsed in the inspector

[LeXXik]

Repro: https://playcanvas.com/project/1216355/overview/attribute-issue