Various fixes and improvements (#96)

* Global variables shared between an interrupt and the main code should be volatile

See: https://www.embedded.com/electronics-blogs/beginner-s-corner/4023801/Introduction-to-the-Volatile-Keyword

* There is no reason to change the active report if it has not changed

* Declare local functions and variables static

This both helps the compiler and the programmer

right/src/eeprom.c

@@ -6,10 +6,10 @@
 #include "config_parser/config_globals.h"
 #include "buffer.h"
 
-bool IsEepromBusy;
+volatile bool IsEepromBusy;
 static eeprom_operation_t CurrentEepromOperation;
 static config_buffer_id_t CurrentConfigBufferId;
-status_t LastEepromTransferStatus;
+static status_t LastEepromTransferStatus;
 void (*SuccessCallback)(void);
 
 static i2c_master_handle_t i2cHandle;