[FL-1783] Power service refactoring (#718)

* settings power: introduce power settings app
* power: move power API to separate file
* settings power: implement reboot scene
* settings power: add power off scene
* assets: add crying dolphin, fix Subghz assets names
* settings power: fix power off scene GUI
* settings power: add battery info scene
* power: add cli to application on start hook
* power: remove power from main menu
* power: move to power service folder
* power service: rework power off logic
* power: add pubsub events
* bt: subscribe to battery level change, update characteristic
* application: change order of Settings applications
* gui: add bubble element
* power: gui improvements
* application: rename Notification -> LCD and notifications
* Applications: menu order according to documentation and add missing power cli init
* settings power: add disconnect USB scene
* power cli: notify user to disconnect USB after poweroff
* Power: update poweroff message in cli

Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>

applications/power/power_service/views/power_off.c

@@ -0,0 +1,57 @@
+#include "power_off.h"
+#include <furi.h>
+#include <gui/elements.h>
+
+struct PowerOff {
+    View* view;
+};
+
+typedef struct {
+    uint32_t time_left_sec;
+} PowerOffModel;
+
+static void power_off_draw_callback(Canvas* canvas, void* _model) {
+    furi_assert(_model);
+    PowerOffModel* model = _model;
+    char buff[32];
+
+    canvas_set_color(canvas, ColorBlack);
+    canvas_set_font(canvas, FontPrimary);
+    canvas_draw_str_aligned(canvas, 64, 1, AlignCenter, AlignTop, "Battery low!");
+    canvas_draw_icon(canvas, 0, 18, &I_BatteryBody_52x28);
+    canvas_draw_icon(canvas, 16, 25, &I_FaceNopower_29x14);
+    elements_bubble(canvas, 54, 17, 70, 30);
+    canvas_set_font(canvas, FontSecondary);
+    elements_multiline_text_aligned(
+        canvas, 70, 23, AlignLeft, AlignTop, "Connect me\n to charger.");
+    snprintf(buff, sizeof(buff), "Poweroff in %lds.", model->time_left_sec);
+    canvas_draw_str_aligned(canvas, 64, 60, AlignCenter, AlignBottom, buff);
+}
+
+PowerOff* power_off_alloc() {
+    PowerOff* power_off = furi_alloc(sizeof(PowerOff));
+    power_off->view = view_alloc();
+    view_allocate_model(power_off->view, ViewModelTypeLocking, sizeof(PowerOffModel));
+    view_set_draw_callback(power_off->view, power_off_draw_callback);
+    return power_off;
+}
+
+void power_off_free(PowerOff* power_off) {
+    furi_assert(power_off);
+    view_free(power_off->view);
+    free(power_off);
+}
+
+View* power_off_get_view(PowerOff* power_off) {
+    furi_assert(power_off);
+    return power_off->view;
+}
+
+void power_off_set_time_left(PowerOff* power_off, uint8_t time_left) {
+    furi_assert(power_off);
+    with_view_model(
+        power_off->view, (PowerOffModel * model) {
+            model->time_left_sec = time_left;
+            return true;
+        });
+}