[Tree widget]: Adjust models and classifications trees visibility handler methods

[JonasDov]

Prerequisite for #1362

Did the same thing that was done in #1401.
Models and classifications trees got updated to use methods from categories visibility handler.

Additionally:

• Models tree visibility handler determines models visibility a little differently from categories or classifications trees. It also checks if Viewport has spatial view. Added this check to getModelsTreeVisibilityStatus in models tree visibility handler.
• Added getCategoriesElementModels to ModelsTreeIdsCache.
• Classifications tree, when determining visibility for categories and elements also checks if Viewport has 2d or 3d view. Added this check to getCategoriesVisibilityStatus and getElementsVisibilityStatus in classifications tree visibility handler.
• Changed names and parameters of ModelsTreeVisibilityHandlerOverrides. It is a breaking change, but the migration should not be too complicated.