add u8g2 and ui libs (#91)

* add u8g2 and ui libs

* add display driver and usage example

* not init display in test mode

* change todo text

* fix removed code

* Target f2 (#107)

* add ioc for flipperzero f2

* add generated f1 files to f2

* regenerate cubemx

* invert initial state of led

* blink backligh

* shutdown backlight on idle

applications/examples/u8g2_example.c

@@ -0,0 +1,36 @@
+#include "u8g2/u8g2.h"
+#include "flipper.h"
+
+void u8g2_example(void* p) {
+    FuriRecordSubscriber* log = get_default_log();
+
+    // TODO try open record and retry on timeout (needs FURI behaviour change)
+    delay(1000);
+    
+    // open record
+    FuriRecordSubscriber* fb_record = furi_open(
+        "u8g2_fb", false, false, NULL, NULL, NULL
+    );
+
+    if(fb_record == NULL) {
+        fuprintf(log, "[widget] cannot create fb record\n");
+        furiac_exit(NULL);
+    }
+
+    while(1) {
+        u8g2_t* fb = furi_take(fb_record);
+        if(fb != NULL) {
+            u8g2_SetFont(fb, u8g2_font_6x10_mf);
+            u8g2_SetDrawColor(fb, 1);
+            u8g2_SetFontMode(fb, 1);
+            u8g2_DrawStr(fb, 2, 12, "hello world!");
+        }
+        furi_commit(fb_record);
+
+        if(fb != NULL) {
+            furiac_exit(NULL);
+        }
+
+        delay(1);
+    }
+}