[FEATURE] Implement several examples for swift-call

[BECATRUE]

Feature you want to implement

In order for beginners to understand swift-call, we need several examples to show swift-call. For this, I want to implement three examples; create / destroy an app, create a frame.

How the feature is implemented

Create an app

• Remove datacalc from setup.json.
• Add a button in dbmgr, which creates datacalc when clicked.

Destroy an app

• If datacalc exists, the above button destroys datacalc when clicked.

Create a frame

• In initial setting, frames() of numgen returns only generatorFrame, not viewerFrame.
• One a number is generated, create the frame viewerFrame.

[BECATRUE]

I will start this issue! @kangz12345