Add interface updateDialogSettingInfo, apps can update print dialog
settings at construction time.
Add docs and UT, fix a bug that may cause a memory leak.
Log: DPrintPreviewDialog add update setting interface.
Influence: Add update setting interface.
* remove redundant "dtkwidget" in include directory;
* improve cmake, modify some variable names, use file() to collect
source files for scalability;
* add full target_link_libraries support.
Log: add full target_link_libraries support
Influence: all projects who include headers directly by path
renbin
wangyixue