Add functionality to the "Convert (Text to Shapes)" button

[DDen4ik-12]

Proposed Changes

This pull request adds functionality to the "Convert" button and makes improvements to the existing method of converting text into shapes.

Known issues:

• The generated text from the shapes is not aligned at the edge, depending on the alignment of the original text.
• Some styles from the original text are not copied to the generated text from the shapes.

Reason for Changes

This pull request was made to help pull request #14 and to implement an unfinished feature.