Link drop-down list and 3d visualization

The selected building in the drop-down list should now be highlighted 
in the Cesium 3d globe

See merge request !26

Wraps logic of applying styling to selected buildings plus removing
duplicate building IDs

Refactor logic of creating a 3d tilset into a new function

Use a third-party library 'SweetAlert' to create popup messages when
errors are thrown as a result of attempting to draw charts

Update the documentation for the repository

See merge request !25

Add details about the web application

Update logic for drop-down list

Further refactoring of the logic for the drop-down lists into new 
module files

See merge request !24

... that conatains information about the SensorThings API server url
and Cesium access token

This function wraps the logic for drawing column charts based on the
selected options for both raw and aggregated observations

This function wraps the logic for drawing column charts based on the
selected options for both raw and aggregated observations

Update logic for drop-down list

Refactor the logic for the drop-down lists into new module files

See merge request !23

Use spread operator to replace the references that contain the values
for the formatted observations and formatted metadata

Use spread operator to replace the references that contain the values
for the formatted observations and formatted metadata

... and formatting

Function that formats observations for line chart or column chart

- Rename references

- Do not reverse the array of colors

Rename references

Replace if/else block with ternary operator

- Rename function since it supports both line and column charts

- Add logic for comparing the lengths of the timestamps and aggregated
values arrays

- Update the function documentation

- Move the function to a different module file

... based on selected drop-dowwn options

Undo tweak error handling

Undo recently added exception capturing, does not work as expected

See merge request !22

Remove the logic that throws an error if there is a problem fetching
metadata and observations. It is currently not working as expected

Remove the logic that throws an error if there is a problem fetching
metadata and observations. It is currently not working as expected

Function provides a 'hack' that ensures that the correct phenomenon
symbols are displayed by a scatter plot's tooltip

Remove intermediate references

Tweak error handling

Tweak how exceptions are captured by the catch blocks

See merge request !21

Check the structure of the arrays of observations + metadata. Throw
errors if there is a problem fetching metadata and observations

Edit creation of y-axis chart titles

Abbreviate the 'temperature' phenomenon names before rendering on 
chart y-axis

See merge request !20