Another try at OGRE2.1/OGRE2.2 on Windows

[mjcarroll]

This provides logic for OGRE2.1 and OGRE2.2 packages from https://github.com/osrf/vcpkg-ports

Originally, we were relying on the cmake find_package mechanism, but if OGRE1.x and OGRE2.x are both installed via vcpkg, there are issues with the cmake logic.

This eliminates all of the cmake logic that comes with OGRE2 and reimplements it locally to find plugins and components that are relevant to ignition development.

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

[ahcorde]

I'm able to compile ign-rendering6 with Ogre2.2 with this PR, but I'm not able to run any of the examples, it's failing in the dlopen in this method Loader::Implementation::LoadLib.

DCO ?

[chapulina]

I think this broke our Windows CI: https://build.osrfoundation.org/job/ign_gazebo-ci-win/120/console

CMake Error in ogre2/src/CMakeLists.txt:
  Imported target "IgnOGRE2::IgnOGRE2" includes non-existent path

    "C:/vcpkg/installed/x64-windows/debug/include/OGRE-2.1"

  in its INTERFACE_INCLUDE_DIRECTORIES.  Possible reasons include:

  * The path was deleted, renamed, or moved to another location.

  * An install or uninstall procedure did not complete successfully.

  * The installation package was faulty and references files it does not
  provide.

[mjcarroll]

Ah, pulling a Windows machine out of CI to test this afternoon.