Shuffeld the difficulty modes again. Now "Easy" is the old Discover; "Normal"...

Shuffeld the difficulty modes again. Now "Easy" is the old Discover; "Normal" is a multi-lifes mode; "Hardcore" is one life and the rest did not change


git-svn-id: http://svn.net-core.org/repos/t-engine4@2196 51575b47-30f0-44d4-a5cc-537603b46e54