Reimplement session saving by moving data from the config file to a session file.
On branch master, changes to be committed:
	modified:   mainwindow.py
	modified:   quarkExtra.py
	new file:   session.json
Clean up code after reimplementing session saving.
On branch master, changes to be committed:
	modified:   config.json
	modified:   mainwindow.py
	modified:   session.json
Implement HTML export.
On branch master, changes to be committed:
	modified:   mainwindow.py
Reimplement Markdown to HTML converter.
On branch master, changes to be committed:
	modified:   mainwindow.py
Fix bug with creation of notes directory.
On branch master, changes to be committed:
	modified:   quarknotemanagermodel.py
Update documentation.
On branch master, changes to be committed:
	modified:   Quark_Documentation/Getting_Started.md
	modified:   README.md