Implement missing vpotmeter for the Win32 GUI.

This item hasn't been rendered so far, and therefore
neither its value would be set nor was there a mouse control.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@36994 b3059339-0415-0410-9bf9-f77b7e298cf2
Cosmetic: Adjust indent.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@36995 b3059339-0415-0410-9bf9-f77b7e298cf2
Remove casts.

Make use of implicit arithmetic conversion
and increase precision at that.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@36996 b3059339-0415-0410-9bf9-f77b7e298cf2
Simplify code.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@36997 b3059339-0415-0410-9bf9-f77b7e298cf2
Remove pointless parentheses.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@36998 b3059339-0415-0410-9bf9-f77b7e298cf2
Fix documentation.

Output format is %3.1f.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@36999 b3059339-0415-0410-9bf9-f77b7e298cf2
Fix dynamic label variables $v and $b in the Win32 GUI.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@37000 b3059339-0415-0410-9bf9-f77b7e298cf2
Increase arithmetic precision.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@37001 b3059339-0415-0410-9bf9-f77b7e298cf2
Make value explicitly type float.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@37002 b3059339-0415-0410-9bf9-f77b7e298cf2