Remove global "using namespace std;" declarations, use "std::" prefixes on all std elements

Fix whitespace changes

src/arch/LoadingWindow/LoadingWindow.cpp

@@ -13,7 +13,7 @@ LoadingWindow *LoadingWindow::Create()
 #endif
 	// Don't load nullptr by default.
 	const RString drivers = "win32,macosx,gtk";
-	vector<RString> DriversToTry;
+	std::vector<RString> DriversToTry;
 	split( drivers, ",", DriversToTry, true );
 
 	ASSERT( DriversToTry.size() != 0 );

src/arch/LoadingWindow/LoadingWindow_MacOSX.mm

@@ -134,7 +134,7 @@ void LoadingWindow_MacOSX::SetSplash( const RageSurface *pSplash )
 {
 	RageFile f;
 	RString data;
-	vector<RString> vs;
+	std::vector<RString> vs;
 
 	// Try to load a custom splash from the current theme, first.
 	GetDirListing( THEME->GetPathG( "Common", "splash"), vs, false, true );

src/arch/LoadingWindow/LoadingWindow_Win32.cpp

@@ -87,7 +87,7 @@ INT_PTR CALLBACK LoadingWindow_Win32::WndProc( HWND hWnd, UINT msg, WPARAM wPara
 	{
 	case WM_INITDIALOG:
 		{
-			vector<RString> vs;
+			std::vector<RString> vs;
 			GetDirListing( "Data/splash*.png", vs, false, true );
 			if( !vs.empty() )
 				g_hBitmap = LoadWin32Surface( vs[0], hWnd );
@@ -176,7 +176,7 @@ void LoadingWindow_Win32::Paint()
 
 void LoadingWindow_Win32::SetText( RString sText )
 {
-	vector<RString> asMessageLines;
+	std::vector<RString> asMessageLines;
 	split( sText, "\n", asMessageLines, false );
 	while( asMessageLines.size() < 3 )
 		asMessageLines.push_back( "" );