Release v1.2.0

I'm happy to announce the release of OpenJournal 1.2.0.

This release adds several new features:

• Markdown syntax (button and keyboard) shortcuts to format text with smart cursor behavior.
• Image support: local or remote images are downloaded and stored in the journal and referenced in the journal entry.
• Smart drag and drop for images and text.
• Each journal entry can be exported in pdf or Markdown file.
• Markdown file can be inserted directly inside a journal entry.
• User manual at https://openjournal.readthedocs.io/en/latest/

And several fixes:

• LaTeX rendering.
• Cursor freezing.
• Qss style.