I'm not sure if it is a good idea to set a global timeout for
all error messages. This should be decided for respective cases.
Timeout for info messages should not be a problem.
The default timeout is set here as global.
Passed timeout for messeages an popup's fired by yWeb API was not really
ok.
For popups now we have a setting with default value of 6 seconds timeout
Popups fired with ShowHint() use this as default. Value of 0 and -1
are ignored.
Messages fired with ShowMsg() should be fixed and interpret
value 0 or -1 as no timeout and will remain on the screen.
Replacing messagebox, hintbox_ext and some derivated parts with
basic class hintbox and derivated class CMsgBox. This should unify
window handling and avoids maintain of multiple classes with quasi
same purpose and adds more functionality.
TODO: fix and optimize details