0.15.0 (M21 - Project scrapbook)

• #210 Copy/paste between projects
• #301 [LVGL] Add lv_tabview
• #400 Add search field to expression builder
• #417 [Dashboard] Large Array.alloc() stops flow.
• #436 [LVGL] gesture event LV_EVENT_GESTURE missing
• #443 [LVGL] exported lvgl code (lv_arc) doesn't respect custom value range
• #446 [LVGL] Add Inner align property in Image widget for version 9
• #452 [Dashboard] An exception occurred while copying a docking manager container
• #454 Show confirmation alert before "Flow support" switch is turned off
• #456 [LVGL] Allow enabling default dark theme in editor and generated files
• #459 Project Editor Scrapbook
• #463 [EEZ Flow] Watch action doesn't work for native string variables
• #469 Add LVGL key definitions to expression builder