Mark all QChar static functions as [[gnu::const]]

The GCC documentation says that a const function is not allowed to read
global memory. This needs to be clarified: it's not allowed to read RW
global memory. It's fine to read read-only memory, as that is equivalent
to just pure code.

The QChar static out-of-line functions only lookup a property of the
given Unicode character and always return the same value.

The only exception is the decomposition() function, which returns a
QString and is therefore not allowed to be marked const.

Change-Id: Id36b2f84a1b8ff9db5acf1d4e59e8b3811068cff
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>

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