* Add `<functional>` include to QStringHash.hpp
This ensures the base `std::hash` template is declared before this
specialization
* Add missing includes to `src/providers/twitch/TwitchAccountManager.hpp`
* Move explicit HelixChatters constructor to the source file
* Remove unused includes & add used includes to NicknamesModel.hpp
* NicknamesModel.hpp: Remove `virtual` when `override` is used
* Add missing QStringHash include to TwitchEmotes.cpp
* Add missing includes to various files
* Print Qt version in cmake step
Technically unrelated, but I'm sneaking it in
* Add changelog entry
