[corrade,magnum,-plugins,-extras,*-integration] Update to v2020.06 (#12211)

2020-07-14T15:38:18+00:00

* [magnum] Improve maintainability of feature to cmake flag conversion

* [magnum] Ignore features not supported on current platform

Allows `vcpkg install magnum[*]` on any platform.

Signed-off-by: Squareys 

* [magnum] Add cglcontext and windowlesscglapplication features

* docs: Update valid VCPKG_CMAKE_SYSTEM_NAME values

Signed-off-by: Squareys 

* [magnum-plugins] Replace deprecated basisu with archive download

Signed-off-by: Squareys 

* [magnum-plugins] Add meshoptimizersceneconverter feature

Signed-off-by: Squareys 

* [magnum-plugins] Also use vcpkg_check_features

Analog to magnum port.

Signed-off-by: Squareys 

* [corrade,magnum,*-plugins,*-extras,*-integration] Update to v2020.06

Signed-off-by: Squareys 

* [meshoptimizer] Add initial port

Signed-off-by: Squareys 

* [magnum-plugins] Replace meshoptimizer download with feature dependency

Signed-off-by: Squareys 

* [corrade,magnum-*] Fix license installation command

Signed-off-by: Squareys 

* [meshoptimizer] Use vcpkg_fixup_cmake_targets

Co-authored-by: Robert Schumacher

vcpkg/ports/meshoptimizer, branch update-geos-381

[corrade,magnum,*-plugins,*-extras,*-integration] Update to v2020.06 (#12211)

[corrade,magnum,-plugins,-extras,*-integration] Update to v2020.06 (#12211)