Copy and paste to object types editor from tileset props/objects

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```
// objecttypes.json
{
"name": "Liquid",
"type": "class",
"members": [
{
"name": "test",
"type": "string",
"value": "foo"
}
],
}

// tileset.tsj props
tiles [{
"id":2,
"properties":[
{
"name":"test",
"type":"string",
"value":"foo"
}, ]
}]
```
So `objecttypes.json` has a member field that is pretty much compatible with tile.properties and or custom objects but you cant copy and paste to the object types editor in the ui. You also can't copy members from objecttypes class to another objecttypes class. I'm currently copying via text editor for now.

Start by comparing the member structure in objecttypes.json with the properties structure in tileset.tsj, then inspect the object types editor and its copy/paste entry points. Done means properties or members can be copied between tileset objects, custom objects, and object types classes through the UI without using a text editor.

Written by the indexing model from the issue text.