clear unnecessary files

clock now roughly works (no Timezone support)
also setting led brightness via encoder works (every 2nd step works,
overflow at FF)

code/inc/DS3231.h

@@ -3,7 +3,7 @@
 
 #include <avr/io.h>
 
-uint32_t DS3231_read(void);
+void DS3231_read(uint8_t dest[3]);
 void DS3231_write(uint8_t inbuffer[3]);
 
 #endif