1. Restructured the conditional logic for libxdg usage to avoid Qt6
compilation errors
2. Moved the DTK_DISABLE_LIBXDG check to outer scope to properly handle
both Qt5 and Qt6
3. Added explicit Qt6 handling by disabling libxdg when not using Qt5
4. This resolves build failures in Qt6 environments where
Qt5XdgIconLoader is not available
The previous implementation only checked for Qt5XdgIconLoader when
using Qt5, but didn't properly handle Qt6 scenarios, causing compilation
errors when building with Qt6.
fix: 修复 Qt6 下 libxdg 编译错误
1. 重构了 libxdg 使用的条件逻辑以避免 Qt6 编译错误
2. 将 DTK_DISABLE_LIBXDG 检查移到外层作用域以正确处理 Qt5 和 Qt6
3. 添加了明确的 Qt6 处理逻辑，在非 Qt5 环境下禁用 libxdg
4. 解决了在 Qt6 环境中因 Qt5XdgIconLoader 不可用而导致的构建失败问题
之前的实现只在 Qt5 环境下检查 Qt5XdgIconLoader，但没有正确处理 Qt6 场
景，导致在使用 Qt6 构建时出现编译错误。
1. Added security hardening compiler flags in debian/rules including
stack protection and RELRO
2. Removed redundant linker flag from dtkgui.cmake that was already set
in debian/rules
3. Consolidated security-related build flags in debian/rules for better
maintainability
4. The changes improve binary security against common exploits while
maintaining compatibility
fix: 增强构建安全加固
1. 在debian/rules中添加了安全加固编译标志，包括栈保护和RELRO
2. 从dtkgui.cmake中移除了已在debian/rules中设置的冗余链接器标志
3. 将安全相关的构建标志整合到debian/rules中以提高可维护性
4. 这些改动提高了二进制文件对常见漏洞攻击的防护能力，同时保持兼容性
- filedrag destroy server to emit serverDestroyed
- compare color sometime failed, convert to rgb first
- ut build without source(cmake -DEnableCov=ON)
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
yeshanshan
ComixHe
ck
WangFei