RemoveNonAutomaticallyInitializedCollections executes too late

[lgarczyn]

Setup:

• create a new collection A
• set A.AutomaticallyLoaded to false
• create empty scene
• add a script that calls CollectionsRegistry.Instance.RegisterCollection(A); on Awake
• Enter playmode

Expected results:

• collection is registered properly

Actual results:

• Awake is called, but A is still in CollectionsRegistry.collections
• RemoveNonAutomaticallyInitializedCollections is then called, removing A
• A is not loaded

Workarounds:

• wait one frame to load collections

Possible solutions:

• do not use the same collections list for editor and playmode
• use PlayModeStateChange.ExitingEditMode instead of PlayModeStateChange.EnteredEditMode

[lgarczyn]

Another issue with modifying collections on enter playmode:

The modifications are serialized, leading to git changes during playmode

The order is not restored properly at the end, leading to semi-random changes to the order of collections every time we leave playmode