Add new web search queries

This adds 15 new web search queries:

• Qt6 documentation (qt6, qt)
• Invent Merge Requests (inventmr, invmr, mr)
• Invent Issues (inventissues, invissues, issues, issue)
• cppreference.com (cppreference, cppref, cpp)
• cplusplus.com (cplusplus)
• Flatpak Documentation (flatpak)
• KReddit (r/kde) (kreddit)
• Krita Manual (kritadocs, kritamanual, krita)
• Linguee (linguee)
• Microsoft C++ Documentation (microsoftcpp, mscpp)
• OpenSUSE Software (opensuse)
• ProtonDB (protondb, proton)
• Reddit (reddit)
• Rust STD Documentation (rust)
• Ubuntu Packages (ubuntu)
• WineHQ Database (winehq, wine)

Updates 3 web search queries:

• KDE API Documentation (use new website) (kde -> kdeapi, kde, api)
• KDE Store (use new name and website) (kdelook, klook, kdel -> kdestore, kdelook, klook, kdel)
• Qt5 API Documentation (no longer latest) (qt -> qt5)

Removes 1 web search query:

• Qt4