UI improvements for desktop app

[shukpa]

The following UX improvments to be made on the Desktop app based on early testing and feedback:

• Simplify the presentation - headlines should be download file, retrieve file, share file. Second option encrypt, then option to drill down to further options if needed (i.e. the choices of key should be an advanced option)
  -- Upload - Put DEK and Chunk under advanced options; DEK is populated to AES by default and there are tooltips for AES and ChaCha
  -- Retrieve - remove UUID from table
• Key pairs to generate automatically stemming from the action, and not be the first step in the flow
• Configuration defaults should be hard coded with the ability to change them but under an advanced menu option. Also should have a “restore default” option
• On the retrieve options, the list of files, perhaps remove UUID/CID since this is available anyway once you click retrieve
• Download file path should be a drop down menu as opposed to manual entry
• The “retrieve shared data” implies that the user is retrieving data they have shared. This should read “Retrieve data received” or some similar language
• For more inexperienced users, make sure that there is a description of what the KEK and DEK types do and the difference between the options
• Make it so that the things that a user has typed save when going from one tab(eg “retrieve” and “share content” for extra convenience