* support folders with files as an alternative to ZIP archives
- compiler update
* updated libJSONCons to v1.4.2
* updated crash handler DLL (exchndl) to v0.9.8
* update to wxMathPlot library
* updated libJSONCons to v1.3.2
* updated libJSONCons to v1.3.0
* make use of new wxSmith code-generation for wxMathPlot
* fix plot axis not being shown
* update to wxMathPlot library to use pi constant from C++ if available