Modernize CMake

[SoapZA]

• Use 'GNUInstallDirs' to be able to set all paths and adhere to GNU coding conventions for the defaults
• Do not use -fPIC for static archives. This places an undue burden on certain architectures that suffer from register pressure, such as x86
• Remove hard coding C++98 into the build system, this is problematic on many levels, as it makes interfacing with the library cumbersome from C++11 and above code
• Set CMAKE_BUILD_TYPE to "Release" if not specified