[stdstring] get rid of CStdString from SaveFileStateJob
[stdstring] get rid of CStdString from a bunch of URIUtils methods that return a string reference.
[stdstring] get rid of CStdString from utils/md5.cpp|h
[stdstring] get rid of CStdString in xbmc/XBDateTime

NOTE: RFC1123 means Month matching can be case-sensitive
[stdstring] get rid of CStdString in CDVDDemux::GetStreamCodecName
[stdstring] get rid of CStdString in CMusicDatabase::Get(Album|Artist)Path
[stdstring] get rid of CStdString in URIUtils::CreateArchivePath()
[stdstring] get rid of CStdString in MultiPath(Directory|File)
[stdstring] get rid of CStdString in a bunch of CUtil functions
[stdstring] get rid of CStdString in StringUtils::WordToDigits, RemoveCRLF, and Join
[stdstring] get rid of CStdString in SpecialProtocol

NOTE: Paths are compared case-sensitive.
[stdstring] get rid of CStdString in LocalizeStrings, LangInfo, LangCodeExpander

NOTE: settings values are compared case-sensitive in SettingOptionsRegionFiller
[stdstring] get rid of CStdString in CCurlFile's http get/post functions
[stdstring] get rid of CStdString in CGUIControlFactory::GetConditionalVisibility
[stdstring] get rid of CStdString in CGUIKeyboardFactory, CGUIWindow::OnEditChanged
[stdstring] get rid of CStdString in CGUIListItem, CFileItem, CFileItemList
[stdstring] get rid of CStdString in xbmc/URL
[stdstring] get rid of CStdString in GUIMediaWindow, and overridden functions in children
[stdstring] get rid of CStdString in IGUIContainer, IGUIControl and implementations
[curl/URL] Compare URL protocol options for CurlFile in lower-case.