add jsonGetBooleanArray and jsonGetRealArray

[eine]

jsonGetBooleanArray and jsonGetRealArray are added, with the same implementation approach as jsonGetIntegerArray: see #7.

However, there is an issue with the current implementation: boolean'value and real'value are used. As explained in https://github.com/Paebbels/JSON-for-VHDL/pull/7#discussion_r190026204, this is not supported by Vivado. Therefore, to_boolean(str : STRING) return BOOLEAN and to_real(str : STRING) return REAL need to be written. to_natural_dec can be used as a reference.

Furthermore, since time_vector is also defined in VHDL 2008, the same approach can be followed to implement jsonGetTimeArray(JSONContext : T_JSON; Path : string) return time_vector. This would require a to_real(str : STRING) return REAL function, along with jsonIsTime(JSONContext : T_JSON; Path : STRING) return BOOLEAN (which does not exist, yet).

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