feat: 框选图层支持自定义触发框选

[lvisei]

PR includes

• feat: 框选图层支持自定义触发框选

Usage

• 按住 shift 键触发框选

const boxSelectLayerGroup = new BoxSelectLayerGroup({
      name: 'boxSelect',
	  options: {
	 	 keyCode: 16,
	  }
 })

• 手动触发框选

const boxSelectLayerGroup = new BoxSelectLayerGroup({
      name: 'boxSelect',
	  options: {
	 	 keyCode: false,
	  }
 })
// 启用框选
boxSelectLayerGroup.enable()
// 关闭框选
boxSelectLayerGroup.disable()

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[lgtm-com]

This pull request fixes 1 alert when merging 3f9e9fc into 609d6e8 - view on LGTM.com

fixed alerts:

• 1 for Unused variable, import, function or class