[FL-872] Furi, API-HAL, App-Loader cleanup and improvements (#334)

* Furi: replace obsolete furiac_exit with osThreadExit, drop obsolete apis and test. Rename systemd to flipper and move to separate file, cleanup. ApiHal: Rename timebase to os and move freertos hooks there, move insomnia api to power module.
* Furi: new thread helper
* Furi: cleanup thread documentation
* Flipper, AppLoader: update to use FuriThread. Update tasks signatures to match FuriThreadCallback signature.
* F4: rename API_HAL_TIMEBASE_DEBUG to API_HAL_OS_DEBUG
* Applications: rename FuriApplication to FlipperApplication, use FuriThreadCallback signature for apps.
* C++ app template sample, new exit method

firmware/targets/api-hal-include/api-hal-power.h

@@ -16,6 +16,25 @@ typedef enum {
 /* Initialize drivers */
 void api_hal_power_init();
 
+/* Get current insomnia level
+ * @return insomnia level: 0 - no insomnia, >0 - insomnia, bearer count.
+ */
+uint16_t api_hal_power_insomnia_level();
+
+/* Enter insomnia mode
+ * Prevents device from going to sleep
+ * @warning Internally increases insomnia level
+ * Must be paired with api_hal_power_insomnia_exit
+ */
+void api_hal_power_insomnia_enter();
+
+/* Exit insomnia mode
+ * Allow device to go to sleep
+ * @warning Internally decreases insomnia level.
+ * Must be paired with api_hal_power_insomnia_enter
+ */
+void api_hal_power_insomnia_exit();
+
 /* Check if deep sleep availble */
 bool api_hal_power_deep_available();
 

firmware/targets/api-hal-include/api-hal.h

@@ -4,9 +4,9 @@
 template <unsigned int N> struct STOP_EXTERNING_ME {};
 #endif
 
-#include "api-hal-resources.h"
-#include "api-hal-timebase.h"
 #include "api-hal-boot.h"
+#include "api-hal-os.h"
+#include "api-hal-resources.h"
 #include "api-hal-gpio.h"
 #include "api-hal-delay.h"
 #include "api-hal-pwm.h"