v0.2: spotify integration & more customisation

yay, spotify!

additions

• local image backgrounds
• background image interpoloation option
• 4 kinds of progress bars & toggle
• progress bar opacity :)
• custom color selection
• custom font!
• customise corner radius settings
• set the gap between the timer and the stuff above & below
• spotify currently playing track + previous/play/pause/next buttons
• added integrations tab to settings

changes

• removed menu bar styling & extended background to cover
• changed "color scheme" to "text color" in settings