interface change initiated
cc1101 interface has been changed.
Minor changes.
receive method has been added.
can_receive method has been added.
SPI module initialization has been fixed.
spi lock has been added.
load cc1101 configuration from the avr program memory.
default configuration settings were taken from data-sheet.
prefer to allocate temporary buffer on stack rather heap which leads to malloc/free calls inseard of simply restoring stack pointer.
port interrupts should be disabled during initialization