Fix cmake variable name mismatches

[JaeseungYeom]

• There are a number of places where non-existent library path variable names are used.
• CMAKE_INSTALL_LIBDIR was used in place of CPP_LOGGER_LIBDIR
• CPP_LOGGER_LIBDIR does not contain CMAKE_INSTALL_PREFIX. So, it needs to be added for library path definition
• CMAKE_INSTALL_BINDIR is only valid with a cmake option CPP_LOGGER_LIBDIR_AS_LIB=ON.
• Set properties of exported target
• There is no variable as CMAKE_INSTALL_DIR. It is replaced with @CPP_LOGGER_LIBDIR@/cmake/cpp-logger