4.1.0

• API: new minor API version 1.2 (#701)
• API: new settings API (#694)
• API: allow requesting notes list in chunks (#720)
• API and frontend: Prevent lost updates by using ETags for notes (#692)
• API and frontend: new attribute "readonly" for read-only notes (#711)
• slow-down refresh interval if app is hidden (#710)
• EasyMDE: Always use contenteditable and native spellcheck (#712)
• fix action buttons running out of window (#717)
• change EasyMDE tab size to 4 (#718)
• maintenance (#693, #699, #705, #709, #719, #723, #727, #731)