Removed position parameter from CUISlider constructor.

git-svn-id: svn://svn.code.sf.net/p/freeorion/code/trunk@7677 dbd5520b-6a0a-0410-a553-f54834df5b05
Removed position parameter from GG::Slider constructor.

git-svn-id: svn://svn.code.sf.net/p/freeorion/code/trunk@7678 dbd5520b-6a0a-0410-a553-f54834df5b05
Removed position parameter from GG::Spin constructor.

git-svn-id: svn://svn.code.sf.net/p/freeorion/code/trunk@7679 dbd5520b-6a0a-0410-a553-f54834df5b05
Removed unused interior color attribute from GG::Spin.

git-svn-id: svn://svn.code.sf.net/p/freeorion/code/trunk@7680 dbd5520b-6a0a-0410-a553-f54834df5b05