* Middle mouse drag to edit numeric values
* The function editor spreadsheet values can be ctrl + dragged to change their value. Alt + click on a key will clear it.
* Added checkbox 'Global Key' to edit tool. (#300)
The code for the global key option was still in place. The only thing missing
was the checkbox in the tool options.
- using std::string;
- using std::wstring;
- using std::ostream;
- using std::istream;
- using std::iostream;
- using std::ostrstream;
- using std::istrstream;
- using std::fstream;
