Update Qt Bridge for Figma terminology

Use less technical terms:

• QML Type -> Component (or Component Type)
• QML ID -> ID 
• QML Properties -> Properties 
• Add Imports -> Add Preset Components

I'm not sure about the last. We are going to try to hide "imports" from QDS, too, but I think you might have to use it here. However, the chosen term for different QML modules is "Preset components", so that is what they will be called in the Library in QDS 2.1.

Qt Bridge for Sketch only uses "Imports" here, so at least we could get rid of "QML".

I'm using the UI here as the starting point, and it might already have been changed; https://doc-snapshots.qt.io/qtdesignstudio-4.14/figmaqtbridge.html

The idea is to get rid of "QML" and replace "QML type" with "Component".