D13082: Make iconFromDirectoryFile() and iconFromDesktopFile() public in KIOCore

[Nathaniel Graham]

ngraham added a dependent revision: D13083: Respect custom directory icons in 
iconNameForURL().

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D13082

To: ngraham, #frameworks, apol
Cc: kde-frameworks-devel, michaelh, ngraham, bruns