[FL-1558] Technical Debt: console, bootloader, targets, stdglue, etc... (#590)

* ApiHal: console abstraction, change uart baud rate to 230400. Bootloader: drop F5. Furi: prevent thread local output to serial console in stdglue.
* ApiHal: take control over system initialization, reorder some subsystems in a hope of fixing USB issues.
* Main: cleanup dead code. ISR: take care of HSECSS by our self. USB: leave clock configuration alone.
* F6 cube: switch RCC to LL.
* Cli: rollback return behavior.

firmware/targets/f6/api-hal/api-hal-console.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include <stddef.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void api_hal_console_init();
+
+void api_hal_console_tx(const uint8_t* buffer, size_t buffer_size);
+
+#ifdef __cplusplus
+}
+#endif