Bsongis/issue 4400 (#4425)

* Cosmetics before fixing #4400

* Cosmetics before fixing #4400

* Now one more conversion issue (SF => SH sources conversion from X9D to X7)

I don't know what is exactly the conversion issue as I don't have the original EEPROM, but I used this one for my tests, so I fix it

* Now we display correctly the corrupted mixers list so that copy/paste will work correctly (it was not consistent)

+ some cosmetics

* Test removed too quickly

* One global removed ;)

companion/src/eeprominterface.cpp

@@ -35,8 +35,6 @@
 #include <stdlib.h>
 #include <bitset>
 
-std::list<QString> EEPROMWarnings;
-
 const uint8_t chout_ar[] = { // First number is 0..23 -> template setup,  Second is relevant channel out
   1,2,3,4 , 1,2,4,3 , 1,3,2,4 , 1,3,4,2 , 1,4,2,3 , 1,4,3,2,
   2,1,3,4 , 2,1,4,3 , 2,3,1,4 , 2,3,4,1 , 2,4,1,3 , 2,4,3,1,