Use macro definitions to manage EEPROM

□Make it easy to reorganization EEPROM items.
□Rename : fmminstepsize -> fmdefaultstepsize

src/constants.h

@@ -93,6 +93,72 @@
 #define SW_MI_BAND_120M     120
 #define SW_MI_BAND_160M     160
 
+// EEPROM index defines
+#define EE_PRESETS_CNT              30
+#define EE_CHECKBYTE_VALUE          34 // 0 ~ 255,add new entry, change for new value 
+    
+#define EE_TOTAL_CNT                268
+#define EE_UINT_FREQUENCY_FM        0
+#define EE_INT_VOLSET               4
+#define EE_UINT_CONVERTERSET        8
+#define EE_UINT_FMLOWEDGESET        12
+#define EE_UINT_FMHIGHEDGESET       16
+#define EE_BYTE_CONTRASTSET         20
+#define EE_BYTE_STEREOLEVEL         21
+#define EE_BYTE_HIGHCUTLEVEL        22
+#define EE_BYTE_HIGHCUTOFFSET       23
+#define EE_INT_LEVELOFFSET          24
+#define EE_BYTE_EDGEBEEP            28
+#define EE_BYTE_SOFTMUTEAM          29
+#define EE_BYTE_SOFTMUTEFM          30
+#define EE_UINT_FREQUENCY_AM        31
+#define EE_BYTE_LANGUAGE            35
+#define EE_BYTE_SHOWRDSERRORS       36
+#define EE_BYTE_TEF                 37
+#define EE_BYTE_DISPLAYFLIP         38
+#define EE_BYTE_ROTARYMODE          39
+#define EE_BYTE_STEPSIZE            40
+#define EE_BYTE_TUNEMODE            41
+#define EE_BYTE_OPTENC              42
+#define EE_BYTE_CHECKBYTE           43
+#define EE_BYTE_IMSSET              44
+#define EE_BYTE_EQSET               45
+#define EE_BYTE_BAND                46
+#define EE_INT_LOWLEVELSET          47
+#define EE_BYTE_MEMORYPOS           51
+#define EE_BYTE_REGION              52
+#define EE_BYTE_RDS_UNDERSCORE      53
+#define EE_BYTE_USBMODE             54
+#define EE_BYTE_WIFI                55
+#define EE_BYTE_SUBNETCLIENT        56
+#define EE_BYTE_SHOWSWMIBAND        57
+#define EE_BYTE_RDS_FILTER          58
+#define EE_BYTE_RDS_PIERRORS        59
+#define EE_PRESETS_BAND_START       60
+#define EE_PRESETS_START            100
+#define EE_PRESETS_FREQUENCY        8750
+
+#define EE_UINT_FREQUENCY_LW        221
+#define EE_UINT_FREQUENCY_MW        225
+#define EE_UINT_FREQUENCY_SW        229
+#define EE_STRING_XDRGTK_KEY        233  // 11 byte
+#define EE_BYTE_SHOWSQUELCH         244
+#define EE_BYTE_SHOWMODULATION      245
+#define EE_BYTE_AM_NB               246
+#define EE_BYTE_FM_NB               247
+#define EE_BYTE_AUDIOMODE           248
+#define EE_BYTE_OIRT                249
+#define EE_UINT_LOWEDGEOIRTSET      250
+#define EE_UINT_HIGHEDGEOIRTSET     254
+#define EE_BYTE_COLORINVERT         258
+#define EE_BYTE_POWEROPTIONS        259
+#define EE_BYTE_CURRENTTHEME        260
+#define EE_BYTE_FMDEFAULTSTEPSIZE   261
+#define EE_BYTE_SCREENSAVERSET      262
+#define EE_INT_AMLEVELOFFSET        263
+#define EE_BYTE_UINT                267      
+// End of EEPROM index defines
+
 static const char* const unitString[] = {"dBμV", "dBf", "dBm"};
 
 static const uint8_t TEFLogo[] PROGMEM = {