UART write example (#53)

* Rename test functions

* rewrite furi API, segfault

* make fixes in FURI, log through FURI

* add uart write example blank

* implement fuprintf instead of fopencookie

* add gif, blank page

* UART write example description

Co-authored-by: Vadim Kaushan <admin@disasm.info>

applications/startup.h

@@ -12,6 +12,7 @@ void flipper_test_app(void* p);
 #endif
 
 void application_blink(void* p);
+void application_uart_write(void* p);
 
 const FlipperStartupApp FLIPPER_STARTUP[] = {
     #ifdef TEST
@@ -21,4 +22,7 @@ const FlipperStartupApp FLIPPER_STARTUP[] = {
     #ifdef EXAMPLE_BLINK
     {.app = application_blink, .name = "blink"},
     #endif
+    #ifdef EXAMPLE_UART_WRITE
+    {.app = application_uart_write, .name = "uart write"},
+    #endif
 };