Make all properties class has access to available on one screen

**Your Godot version:**

3.2.3

**Issue description:**

Documentation is often confusing at times you need to have 5 or 6 tabs open to understand what you can do with given class resulting in you flipping between all of them back and forth. This adds a strain on cognitive load to grasp a topic

**URL to the documentation page (if already existing):**

https://docs.godotengine.org/en/stable/classes/class_checkbox.html as example to understand what I can do with this class I need to have multiple tabs open. Even for properties that override parents there is no easy way of finding out what they do. For example `CheckBox` has property `ToggleMode` that overrides parent. In fact it really doesn't it override grandparent `ButtonBase` so the user needs to skip through multiple tabs to even understand what it does.

Instead we could have all methods listed in one place.

You could start with folded view that looks like this


And if user wants to look at all the methods he can expand them

as result if user clicks on the `ToggleMode` method that is being overridden he/she would be taken straight to this method description. Rather than needing to open multiple screens something that is especially PITA when done directly from Godot editor he could have access to everything he wants.

We already have ability to fold text in editor so this is more than doable.