* Rewrite update check
Before release, the update URL will need to be changed to an official
one.
* remove syntax macros: CASE, __OR, and DEFAULT
* define VC_EXTRALEAN
* modify the URL of opentoonz-version.txt
* fix a type of updateUrl
* remove meanless comments
- using std::string;
- using std::wstring;
- using std::ostream;
- using std::istream;
- using std::iostream;
- using std::ostrstream;
- using std::istrstream;
- using std::fstream;
