Version 2.5.0 release

The new release includes changes for error domain of Hinawa.FwReqError.
In GNOME convention, the error domain and code enumeration should be
the same name. In libhinawa implementation, Hinawa.FwReqError domain
utilizes Hinawa.FwRcode as its code enumeration against the convention.
Hinawa.FwReqError enumeration is now added.

Additionally, documentation framework is switched from gtk-doc to
gi-docgen, according to recent integration of GNOME software.
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