Fix some profession items in character creation screen do not fit on the screen

Fixes #6915

This moves the list of skills, items and addictions into one window, and
Makes the content of that window scrollable (using the formerly unused entries LEFT and RIGHT):

![screenschot-2014-10-28-18-39-27](https://cloud.githubusercontent.com/assets/5095435/4813591/c2deafdc-5ec9-11e4-8fdd-2ab37b24570d.png)


This allows to display any number of entries there. More stuff could be added to that window (recipes etc.)

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~~Possible improvements:~~

~~The headers ("Profession items" / "Profession skills" / "Addictions") do no stand out much (they are white, the items are listed in light gray), perhaps those headers should use a different color, or have a a blank line before them.~~

~~The order (items -> skills -> addictions) is unfortunate as the addictions are probably the most important one. I propose this order: addictions -> skills -> items. Also I propose to get rid of the "Skills: none" entry and instead handle that as simply not showing the skills part at all.~~

Done.