remove project getter and project_slug var, fix feature_edit & basemaps

src/store/modules/feature.store.js

src/store/modules/map.store.js

src/store/modules/projects.store.js

src/views/feature/Feature_detail.vue

src/views/feature/Feature_edit.vue

src/views/feature/Feature_list.vue

src/views/feature_type/Feature_type_symbology.vue

src/views/project/Project_members.vue