Fix lots of warnings (gcc and krazy), API doc fixes, clean up includes ...

Fix warnings:
* explicit constructors
* naming convention of include guards
* allocate dialogs on heap and hold in QPointer
* add newline at EOF

Update website in README, main.cpp, and lskat.lsm

Fix some issues in API documentation

Fix some spelling errors in strings

Clean up includes, in particular remove unused includes

REVIEW: 125906