Draft: More Docs

This MR:

• adds docs to classes that were lacking like KAuthorized, KDestopFile and KEmailSettings
• clarifies docs on the use of KConfig/KConfigGroup/KSharedConfig
• exposes classes and especially enums that weren't exposed before
• links things, removes links to techbase
• reformats some lines to 80 chars

It's still missing:

• Mainpage.dox and README changes
• KConfigGroup which is massive