[FL-931] keypad test app, canvas draw circle/disc functions (#364)

* new keypad test app, added canvas circle/disc fn
* resources cleanup on exit
* fix - release mutex

Co-authored-by: coreglitch <mail@s3f.ru>

applications/gui/canvas.h

@@ -132,6 +132,16 @@ void canvas_draw_frame(Canvas* canvas, uint8_t x, uint8_t y, uint8_t width, uint
  */
 void canvas_draw_line(Canvas* canvas, uint8_t x1, uint8_t y1, uint8_t x2, uint8_t y2);
 
+/*
+ * Draw circle at x,y with radius r
+ */
+void canvas_draw_circle(Canvas* canvas, uint8_t x, uint8_t y, uint8_t r);
+
+/*
+ * Draw disc at x,y with radius r
+ */
+void canvas_draw_disc(Canvas* canvas, uint8_t x, uint8_t y, uint8_t r);
+
 /*
  * Draw glyph
  */