Furi (#24)

* furiac start and thread create implementation"

* create and kill task

* rename debug, add header

* remove write.c

* kill itself

* furi exit/switch

* success switch and exit

* WIP furi records

* add furi record interface

* rename furi app control file

* record implementation in progress

* wip furi implementation

* add automatic tests for FURI AC

* differ build tests

* small changes

* FURI record tests description

* change furi statuses

* FURI record test blank

* exit after all application ends

* delay: print then wait

* fix FURI implementatnion building

* pipe record test

* concurrent access

* uncomplete mute-test

* update FURI documentation

core/flipper.h

@@ -1,8 +1,15 @@
+#ifdef __cplusplus
 extern "C" {
+#endif
+
     #include "main.h"
     #include "flipper_hal.h"
     #include "cmsis_os.h"
+    #include "furi.h"
+
+#ifdef __cplusplus
 }
+#endif
 
 // Arduino defines