FL-819 new first start screen, add multiline text (#318)

* GUI Canvas: get current font height routine
* Dolphin: new start screen. GUI: new multiline element.
* Dolphin: up state version to reset it for everyone
* Dolphin: take maximum of idle screen height
* Dolphin: frames on first start screen.

applications/gui/canvas.h

@@ -1,7 +1,6 @@
 #pragma once
 
 #include <stdint.h>
-#include <u8g2.h>
 #include <gui/icon.h>
 #include <assets_icons_i.h>
 
@@ -30,6 +29,12 @@ uint8_t canvas_width(Canvas* canvas);
  */
 uint8_t canvas_height(Canvas* canvas);
 
+/*
+ * Get current font height
+ * @return height in pixels.
+ */
+uint8_t canvas_current_font_height(Canvas* canvas);
+
 /*
  * Clear canvas, clear rendering buffer
  */