improve engine cmd line parsing and its documentation

Documented an unclear method call

Reloads PAGE_SETUP values after clearing passwordhash

Added handling of not registered nicks (no change-server side tho), clearPasswordHash() also now sets the savepassword setting to false

Merge from parent

Reverted password loading in PAGE_SETUP, changed the value of passwordlength to save, added clearing of hashes after a 'Wrong password' RetryDialog

Added a hack that activates a RetryDialog in case the user is banned for 'Reconnect too fast'. Set all string used in RetryDialog to be translated

fixed minor problem with saving hash

Removed whitespaces, refactored hash setting getting and clearing

Removed commented-out unused code

*sigh*

Patched login dialog bugs, added retry dialogs

Try to be friendlier to small screen sizes. Use 800x600 if width/height of 2/3rds is smaller than 800x600 (things don't look smaller than that size), use desktop size if it is for some reason smaller than 800x600

uint32_t -> quint32

Fix linux build broken in ra1577759bf62 (probably)