Make arrays const which should be const

const char * x is a variable which points to const char, but can be changed itself
Fixed by either marking the * const - > const char * const x
or by removing the * and postfixing the var with the array marker [] -> const char x[]

const char * x[] is an array (of fixed size, as initialized) whose elements point to const char, but which can be changed itself
Fixed by marking the pointers const -> const char * const x[]

These fixes both result in protecting against unwanted changes and remove
one indirection, as the compiler knows at compile time which data is
really referenced by the now non-variable but const x.