added loadingstrategy support to SourceVectorComponent
added loadingstrategy support to SourceVectorComponent

quentin-ol/ngx-openlayers,quentin-ol/ngx-openlayers,quentin-ol/ngx-openlayers,karomamczi/ngx-openlayers,karomamczi/ngx-openlayers,karomamczi/ngx-openlayers