Reorganize repository

* Move the project top-level CMakeLists.txt to the root of the project;
  this allows building Cyclone as part of ROS2 without any special
  tricks;

* Clean up the build options:

  ENABLE_SSL:    whether to check for and include OpenSSL support if a
                 library can be found (default = ON); this used to be
                 called DDSC_ENABLE_OPENSSL, the old name is deprecated
                 but still works
  BUILD_DOCS:    whether to build docs (default = OFF)
  BUILD_TESTING: whether to build test (default = OFF)

* Collect all documentation into top-level "docs" directory;

* Move the examples to the top-level directory;

* Remove the unused and somewhat misleading pseudo-default
  cyclonedds.xml;

* Remove unused cmake files

Signed-off-by: Erik Boasson <eb@ilities.com>

src/docs/GettingStartedGuide/uninstall.rst

@@ -1,22 +0,0 @@
-..
-   Copyright(c) 2006 to 2018 ADLINK Technology Limited and others
-
-   This program and the accompanying materials are made available under the
-   terms of the Eclipse Public License v. 2.0 which is available at
-   http://www.eclipse.org/legal/epl-2.0, or the Eclipse Distribution License
-   v. 1.0 which is available at
-   http://www.eclipse.org/org/documents/edl-v10.php.
-
-   SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
-
-.. _`Uninstall`:
-
-.. raw:: latex
-
-    \newpage
-
-################################
-Uninstalling Eclipse Cyclone DDS
-################################
-
-TBD.