Furi: core refactoring and CMSIS removal part 2 (#1410)

* Furi: rename and move core
* Furi: drop CMSIS_OS header and unused api, partially refactor and cleanup the rest
* Furi: CMSIS_OS drop and refactoring.
* Furi: refactoring, remove cmsis legacy
* Furi: fix incorrect assert on queue deallocation, cleanup timer
* Furi: improve delay api, get rid of floats
* hal: dropped furi_hal_crc
* Furi: move DWT based delay to cortex HAL
* Furi: update core documentation

Co-authored-by: hedger <hedger@nanode.su>

furi/core/timer.h

@@ -0,0 +1,61 @@
+#pragma once
+
+#include "core/base.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef void (*FuriTimerCallback)(void* context);
+
+typedef enum {
+    FuriTimerTypeOnce = 0, ///< One-shot timer.
+    FuriTimerTypePeriodic = 1 ///< Repeating timer.
+} FuriTimerType;
+
+typedef void FuriTimer;
+
+/** Allocate timer
+ *
+ * @param[in]  func     The callback function
+ * @param[in]  type     The timer type
+ * @param      context  The callback context
+ *
+ * @return     The pointer to FuriTimer instance
+ */
+FuriTimer* furi_timer_alloc(FuriTimerCallback func, FuriTimerType type, void* context);
+
+/** Free timer
+ *
+ * @param      instance  The pointer to FuriTimer instance
+ */
+void furi_timer_free(FuriTimer* instance);
+
+/** Start timer
+ *
+ * @param      instance  The pointer to FuriTimer instance
+ * @param[in]  ticks     The ticks
+ *
+ * @return     The furi status.
+ */
+FuriStatus furi_timer_start(FuriTimer* instance, uint32_t ticks);
+
+/** Stop timer
+ *
+ * @param      instance  The pointer to FuriTimer instance
+ *
+ * @return     The furi status.
+ */
+FuriStatus furi_timer_stop(FuriTimer* instance);
+
+/** Is timer running
+ *
+ * @param      instance  The pointer to FuriTimer instance
+ *
+ * @return     0: not running, 1: running
+ */
+uint32_t furi_timer_is_running(FuriTimer* instance);
+
+#ifdef __cplusplus
+}
+#endif