GUI app (experimental) (#730)

* add default config

* first pass

* flake8

* cleanup

* first pass at using qthreads

* cleanup

* WIP

* better error handling

* improved UI

* bugfix

* fix merge bugs

* import order

* cleanup

* make gui requirements optional

* pr review requested changes

* Update server/gui/main.py

Co-Authored-By: csweaver <charlottesweaver@gmail.com>

* pr review request

* qt child class methods -> camelCase

* whitespace

.gitignore

@@ -27,6 +27,9 @@ server/app/web/templates/index\.html
 .ipynb_checkpoints
 *.ipynb
 
+# cefpython
+error.log
+
 # misc
 .DS_Store
 npm-debug.log