CFile: Handle paths like "~/foo"

This let's CFile expand relative-to-home paths. I "accidentally" broke
ISpoofFile with some recent commit and that is now fixed with this. This should
solve this problem for quite a lot of other places, too.

Idea (c) by DarthGandalf, thanks. :)

Signed-off-by: Uli Schlachter <psychon@znc.in>

FileUtils.cpp

@@ -37,7 +37,10 @@ CFile::~CFile() {
 }
 
 void CFile::SetFileName(const CString& sLongName) {
-	m_sLongName = sLongName;
+	if (sLongName.Left(2) == "~/") {
+		m_sLongName = CZNC::Get().GetHomePath() + sLongName.substr(1);
+	} else
+		m_sLongName = sLongName;
 
 	m_sShortName = sLongName;
 	m_sShortName.TrimRight("/");