Add Tooltip and Popups for markers/lines

[savage13]

Adds Popups to edit descriptions of Markers and Polylines as referenced in #19
Add Tooltips taken from the title value.

This add an AppMapPopup.vue with associated Typescript file. This vue emits messages title and text when the values are changed to keep the GeoJSON in sync.

If the Marker structure includes feature.properties it will save these values to the exported file, see https://stackoverflow.com/a/35819611

I am open to improvements to the popup's style or keeping the GeoJSON properties in sync.

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This change is 

[leoetlino]

Have you tested whether existing GeoJSON data can still get re-imported correctly?

[savage13]

• The two functions (addGeoJSONFeatureToLayer and addPopupAndTooltip) were moved up in the file and are now free.
• Fixed space and single quote formatting issues.
• I grabbed a JSON file from the current objmap and was able to successfully load it when using the updated code. 😃 The JSON file contained a line and a couple of markers (I think that covers the available features).