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/event_flag.h

@@ -0,0 +1,70 @@
+/**
+ * @file event_flag.h
+ * Furi Event Flag
+ */
+#pragma once
+
+#include "base.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef void FuriEventFlag;
+
+/** Allocate FuriEventFlag
+ *
+ * @return     pointer to FuriEventFlag
+ */
+FuriEventFlag* furi_event_flag_alloc();
+
+/** Deallocate FuriEventFlag
+ *
+ * @param      instance  pointer to FuriEventFlag
+ */
+void furi_event_flag_free(FuriEventFlag* instance);
+
+/** Set flags
+ *
+ * @param      instance  pointer to FuriEventFlag
+ * @param[in]  flags     The flags
+ *
+ * @return     Resulting flags or error (FuriStatus)
+ */
+uint32_t furi_event_flag_set(FuriEventFlag* instance, uint32_t flags);
+
+/** Clear flags
+ *
+ * @param      instance  pointer to FuriEventFlag
+ * @param[in]  flags     The flags
+ *
+ * @return     Resulting flags or error (FuriStatus)
+ */
+uint32_t furi_event_flag_clear(FuriEventFlag* instance, uint32_t flags);
+
+/** Get flags
+ *
+ * @param      instance  pointer to FuriEventFlag
+ *
+ * @return     Resulting flags
+ */
+uint32_t furi_event_flag_get(FuriEventFlag* instance);
+
+/** Wait flags
+ *
+ * @param      instance  pointer to FuriEventFlag
+ * @param[in]  flags     The flags
+ * @param[in]  options   The option flags
+ * @param[in]  timeout   The timeout
+ *
+ * @return     Resulting flags or error (FuriStatus)
+ */
+uint32_t furi_event_flag_wait(
+    FuriEventFlag* instance,
+    uint32_t flags,
+    uint32_t options,
+    uint32_t timeout);
+
+#ifdef __cplusplus
+}
+#endif