Release icewm-1.3.10

This is the latest release of the icewm carryon fork. This is a stable release and has soaked for several mothns without any issues. See the NEWS file in the release for details. Included in this release is a complete cmake build system in parallel to an autoconf build system (see INSTALL.cmakebuild in the release). Many other enhancements and features were added by @Code7R and a growing number of other contributors. More enhancements are on the horizon. This carryon fork has been picked up by a number of the more significant distributions (distrowatch top 10 list). I hope you enjoy.