(1) "geoselectchanged" event: add param: allSelected: { geoIndex: number, name: string[] }[]
(2) geoSVG resource support:
+ label
+ emphasis/select/blur state
+ "geoselectchanged" event (on geo component)
+ "selectchanged" event (on map series)
(3) some refactor to make those happen:
+ The original `Region` is migrated to `GeoJSONRegion`. And make `Region` as the base class of `GeoJSONRegion` and `GeoSVGRegion`.
+ Modify the constructor of `Geo`.

And add rule "no-var" to eslintrc

Use eslint rule to check the diff between var and let:
    "no-use-before-define": "off"
    "@typescript-eslint/no-use-before-define": 2
    no-redeclare: 2
    block-scoped-var: 2
    no-loop-func: 2
(2) By the way add some eslint rule and unify some code style.