* FuriHal: allow nulling null isr * FuriHal: include interrupt priority 15 as allowed * Furi: prevent compiler from optimizing arg in r0 of RESTORE_REGISTERS_AND_HALT_MCU
* FuriHal: allow nulling null isr * FuriHal: include interrupt priority 15 as allowed * Furi: prevent compiler from optimizing arg in r0 of RESTORE_REGISTERS_AND_HALT_MCU