Added 'Start new chat with this flowchart'

The quality of flowchart generations can decrease if the ‘context window’ gets too big.

The ‘context window’ is the amount of messages and flowcharts in the current chat.

Often, you will only care about the AI having the current flowchart you are viewing in its context window.

This feature allows you to start a new chat with the current flowchart as the only thing in the context window.