Since xdgiconloader is not adapted to Qt6, libxdg is disabled by default when compiling Dtk6
Do not install dconfig file in dtkgui to avoid conficts with dtk6gui
C++ 17 by default
DVERSION ==> DTK_VERSION
cmake_minimum_required 3.13
tools install to CMAKE_INSTALL_LIBEXECDIR
1. Dynamically load libraw.so to support RAW image fomats.
2. Improve some implementations, Update unit cases and docs.
3. Move image-handler from folder example to tool.
Log: Support RAW image formats.
Influence: Add build dependency libraw-dev.
Add the DImagehandler class, provide functions such as reading image,
rotating image, getting image metadata. DImagehandler dynamically load
libfreeimage to support extended image formats.
Log: Add the DImagehandler class.
Influence: Add build dependency libfreeimage-dev.
I change the source code from qmake to cmake. Move the files
which will be install to the /usr/include to $root/include, which will
help to mattern match and easylier to do install. and the change will
break the build of qmake
Log: from qmake to cmake
Influence: qmake is breaked
DCI icons need the support of webp plugin when parsing
some icons, otherwise the images will not be displayed
normally.
Log:
Influence: Dtkgui dependence
Change-Id: I9c4a780dc23fdf2e96c9e23e6580b4efd56f695b