editor: fixes issues #3318 and #3394

[jacomyal]

About #3318:

• Uses each track range direction instead of trying to find which way to go by comparing current range extremities to last point crossed
• Adds some unit tests for the routes geometry computation helpers

About #3394:

• Since hovered entities are not accurate enough, the hovered track section is fully loaded before trying to determinate which extremity is the closest to the mouse
• The hovered endpoint is now saved in the SwitchEditionState, and the exact same value is used when the user clicks, so that we are sure the selected endpoint is the same as the one displayed over the map

[codecov]

Codecov Report

Merging #3554 (6aed7ab) into dev (320dcc3) will decrease coverage by 0.11%.
The diff coverage is 71.08%.

❗ Current head 6aed7ab differs from pull request most recent head 7c40648. Consider uploading reports for the commit 7c40648 to get more accurate results

@@             Coverage Diff              @@
##                dev    #3554      +/-   ##
============================================
- Coverage     68.23%   68.12%   -0.11%     
  Complexity     1896     1896              
============================================
  Files           413      414       +1     
  Lines         20526    20804     +278     
  Branches       1519     1534      +15     
============================================
+ Hits          14005    14173     +168     
- Misses         5820     5915      +95     
- Partials        701      716      +15     

Flag	Coverage Δ
front	56.31% <71.08%> (+0.11%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
front/src/applications/editor/data/api.ts	31.88% <0.00%> (+3.62%)	⬆️
...rc/applications/editor/tools/routeEdition/utils.ts	43.93% <71.95%> (ø)

... and 6 files with indirect coverage changes

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