Custom font set function (#2261)

* custom font set function
* update API symbols
* add example of custom font usage
* delete u8g2 dependency in example custom font
* rename to canvas_set_custom_u8g2_font
* now change the name in ALL places

Co-authored-by: あく <alleteam@gmail.com>
Co-authored-by: hedger <hedger@users.noreply.github.com>

applications/services/gui/canvas.c

@@ -137,6 +137,12 @@ void canvas_set_font(Canvas* canvas, Font font) {
     }
 }
 
+void canvas_set_custom_u8g2_font(Canvas* canvas, const uint8_t* font) {
+    furi_assert(canvas);
+    u8g2_SetFontMode(&canvas->fb, 1);
+    u8g2_SetFont(&canvas->fb, font);
+}
+
 void canvas_draw_str(Canvas* canvas, uint8_t x, uint8_t y, const char* str) {
     furi_assert(canvas);
     if(!str) return;