Vendor CLI11 library inside ignition-utils

Signed-off-by: Michael Carroll <michael@openrobotics.org>

CMakeLists.txt

@@ -32,7 +32,8 @@ ign_configure_project(VERSION_SUFFIX pre1)
 #============================================================================
 # Configure the build
 #============================================================================
-ign_configure_build(QUIT_IF_BUILD_ERRORS)
+ign_configure_build(QUIT_IF_BUILD_ERRORS
+  COMPONENTS cli)
 
 #============================================================================
 # Create package information

cli/LICENSE

@@ -0,0 +1,25 @@
+CLI11 1.8 Copyright (c) 2017-2019 University of Cincinnati, developed by Henry
+Schreiner under NSF AWARD 1414736. All rights reserved.
+
+Redistribution and use in source and binary forms of CLI11, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+3. Neither the name of the copyright holder nor the names of its contributors
+   may be used to endorse or promote products derived from this software without
+   specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

cli/README.md

@@ -0,0 +1,7 @@
+Ignition CLI component
+
+Vendored from https://github.com/CLIUtils/CLI11/
+
+At Revision 1.9.1: https://github.com/CLIUtils/CLI11/releases/tag/v1.9.1
+
+For information about license, consult LICENSE file

cli/include/ignition/utils/CMakeLists.txt

@@ -0,0 +1 @@
+ign_install_all_headers(COMPONENT cli)