Flash saving (idea from er9x)

Trims2Offsets function removed as it was as full of bugs than other firmwares (total = ~1000bytes flash saved)
A "Safety CHxx" function is not applied when it is currently edited
The Stick Mode needs confirmation before being used (now edited with [MENU] edit [MENU]).

src/o9xstrings.cpp

@@ -33,54 +33,56 @@
 
 #include "open9x.h"
 
+#define ISTR(x) LEN_##x TR_##x
+
 // The non-0-terminated-strings
 const pm_char STR_OPEN9X[] PROGMEM =
-    TR_OFFON
-    TR_MMMINV
-    TR_NCHANNELS
-    TR_VBEEPMODE
-    TR_VBEEPLEN
-    TR_ADCFILTER
-    TR_WARNSW
-    TR_TRNMODE
-    TR_TRNCHN
-    TR_VTRIMINC
-    TR_RETA123
-    TR_VPROTOS
-    TR_POSNEG
-    TR_VCURVEFUNC
-    TR_CURVMODES
-    TR_EXPLABELS
-    TR_VMLTPX
-    TR_VMLTPX2
-    TR_VMIXTRIMS
-    TR_VCSWFUNC
-    TR_VFSWFUNC
-    TR_FUNCSOUNDS
+    ISTR(OFFON)
+    ISTR(MMMINV)
+    ISTR(NCHANNELS)
+    ISTR(VBEEPMODE)
+    ISTR(VBEEPLEN)
+    ISTR(ADCFILTER)
+    ISTR(WARNSW)
+    ISTR(TRNMODE)
+    ISTR(TRNCHN)
+    ISTR(VTRIMINC)
+    ISTR(RETA123)
+    ISTR(VPROTOS)
+    ISTR(POSNEG)
+    ISTR(VCURVEFUNC)
+    ISTR(CURVMODES)
+    ISTR(EXPLABELS)
+    ISTR(VMLTPX)
+    ISTR(VMLTPX2)
+    ISTR(VMIXTRIMS)
+    ISTR(VCSWFUNC)
+    ISTR(VFSWFUNC)
+    ISTR(FUNCSOUNDS)
 #ifdef FRSKY
-    TR_VTELEMBARS
-    TR_VTELEMUNIT
-    TR_VALARM
-    TR_VALARMFN
-    TR_VTELPROTO
-    TR_TELEMCHNS
+    ISTR(VTELEMBARS)
+    ISTR(VTELEMUNIT)
+    ISTR(VALARM)
+    ISTR(VALARMFN)
+    ISTR(VTELPROTO)
+    ISTR(TELEMCHNS)
 #endif
 #ifdef TEMPLATES
-    TR_VTEMPLATES
+    ISTR(VTEMPLATES)
 #endif
 #ifdef HELI
-    TR_VSWASHTYPE
+    ISTR(VSWASHTYPE)
 #endif
-    TR_VKEYS
-    TR_VSWITCHES
-    TR_VSRCRAW
-    TR_VTMRMODES
+    ISTR(VKEYS)
+    ISTR(VSWITCHES)
+    ISTR(VSRCRAW)
+    ISTR(VTMRMODES)
 #if defined(DSM2)
-    TR_DSM2MODE
+    ISTR(DSM2MODE)
 #endif
 #if defined(PCBV4)
-    TR_RE1RE2
-    TR_DATETIME
+    ISTR(RE1RE2)
+    ISTR(DATETIME)
 #endif
     ;
 
@@ -136,7 +138,6 @@ const pm_char STR_DELAYUP[] PROGMEM = TR_DELAYUP;
 const pm_char STR_SLOWDOWN[] PROGMEM = TR_SLOWDOWN;
 const pm_char STR_SLOWUP[] PROGMEM = TR_SLOWUP;
 const pm_char STR_MIXER[] PROGMEM = TR_MIXER;
-const pm_char STR_COPYTRIMMENU[] PROGMEM = TR_COPYTRIMMENU;
 const pm_char STR_CV[] PROGMEM = TR_CV;
 const pm_char STR_SW[] PROGMEM = TR_SW;
 const pm_char STR_ACHANNEL[] PROGMEM = TR_ACHANNEL;
@@ -173,7 +174,6 @@ const pm_char STR_MEMORYWARNING[] PROGMEM = TR_MEMORYWARNING;
 const pm_char STR_ALARMWARNING[] PROGMEM = TR_ALARMWARNING;
 const pm_char STR_NODATAALARM[] PROGMEM = TR_NODATAALARM;
 const pm_char STR_RXCHANNELORD[] PROGMEM = TR_RXCHANNELORD;
-const pm_char STR_MODE2[] PROGMEM = TR_MODE2;
 const pm_char STR_SLAVE[] PROGMEM = TR_SLAVE;
 const pm_char STR_MODESRC[] PROGMEM = TR_MODESRC;
 const pm_char STR_MULTIPLIER[] PROGMEM = TR_MULTIPLIER;