Update const string definitions

[sfe-SparkFro]

From @gigapod in #10:

For all these constant defines:

const char const

Which is : const data type ('the string') and const pointer ('the pointer') not just

const char

Which is just saying this symbol points to 'constant data'

We all make this mistake.

And if I was being really pedantic - I'd use const char * const - the use of "[]" to declare a pointer array is valid, but off standard.