wxChartDir adjustments for support of ChartDirector 7

[utelle]

Introduction

In May 2021 the C++ version of ChartDirector 7 was released by Advanced Software Engineering. However, the release was not yet officially announced.

In the meantime wxChartDir has been adjusted to support ChartDirector 7. A new wxChartDir version, 2.0.0, will be released, after ChartDirector 7 will have been officially announced.

Major changes

• Support for enhanced dynamic tooltips (new in ChartDirector 7)
• Support for DPI awareness (new in ChartDirector 7)
• Enhancement of handling selection boxes (less flicker)
• Support for loading resources (like images and icons) from graphics files (similar to the QT version)

Notes

• Support for wxWidgets 2.x has been dropped.
• wxWidgets 3.0.x lacks High DPI Awareness support, and will not be supported, unless there is a real demand.
• wxWidgets 3.1.x is supported.
• Build files are provided for Visual C++ 2015, 2017, and 2019, and MinGW-w64, as well as for the autoconf/automake toolchain. Visual C++ versions below Visual C++ 2015 may work, but have not been tested.

Feedback is always welcome.