add vectortile layer

.gitlab-ci.yml

build/common.js

build/webpack.config.js

demo/examples/commons/config.js

demo/examples/commons/data.js

demo/examples/example1/example.js

demo/examples/example1/index.html

demo/examples/example2/example.js

demo/examples/example2/index.html

package.json

src/DMap/Model/Layer/VectorTile.js

src/DMap/Model/LayerConstants.js

src/DMap/Model/LayerNamespace.js

src/DMap/Model/MapContent.js

src/DMap/Model/ResourceLayer.js