Increased minimum required version for cmake.

modified:   CMakeLists.txt
modified:   usr/CMakeLists.txt
modified:   usr/bin/CMakeLists.txt
modified:   usr/etc/CMakeLists.txt
modified:   usr/include/CMakeLists.txt
modified:   usr/lib/CMakeLists.txt
modified:   usr/local/CMakeLists.txt
modified:   usr/local/documentation/CMakeLists.txt
modified:   usr/sbin/CMakeLists.txt
modified:   usr/share/CMakeLists.txt
modified:   usr/src/CMakeLists.txt
modified:   usr/src/libtgecore/CMakeLists.txt