update vue-maplibre-compare and fix screenshots

[BryonLewis]

resolve #283

• Updates vue-maplibre-compare so that ToggleMapCompare and MapCompare have a new field named preserveDrawingBuffer that defaults to false but can be set to true for sharing the buffer.
• renamed the Map.vue that is no longer used to LegacyMap.vue to indicate it's legacy usage.
• Comparison mode screenshots will only grab the Map A Canvas. This is because comparison utilizes a css clip-path which doesn't look like it is supported by html2canvas
  • A possible solution is create a function that when screenshot is taken it draws the two separate maps into a single canvas object based on the slider position and uses that as the base canvas. I need to do more testing to see if it works.
  • Decided on hiding the screenshot button when in Compare Mode

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