* Track and restore current style
* Auto switch to new style page
* Auto Switch to drag/drop-merged palette page
* Default to style 1 when returning to deleted style
* Remove license support, and old editions
Previously, old code to support various editions of Toonz, as well as
license activiation code, was cluttering the repository.
Support for LINETEST is retained.
* fix conflicts
- using std::string;
- using std::wstring;
- using std::ostream;
- using std::istream;
- using std::iostream;
- using std::ostrstream;
- using std::istrstream;
- using std::fstream;