Updated extension: distance evaluation for Linked Object Tools

[D8H]

Describe the extension

This is an update to: #122 and #140
It add

• an action get the distance of the instance that has been traveled
• actions to link neighbors on rectangular grids, isometric grids and hexagonal grids.

http://wiki.compilgames.net/doku.php/gdevelop5/all-features/extensions/linked-objects-tools

An example that shows how to evaluate distance by roads to define rules for city builders uses it (4ian/GDevelop#2638)

Checklist

• Extension has a proper name and description.
• Extension has tags (for example: "platform, brick, breakable").
• All behaviors have a description.
• All functions (actions, conditions, expressions) have descriptions.
• I confirm that this extension can be integrated to this GitHub repository, distributed and MIT licensed.

Extension file

https://www.dropbox.com/s/dyjlfzc2ok6f6dd/LinkTools.zip?dl=1

Idea box

I think it could be useful for point and click to bypass obstacles with a predetermined polygonal chain, so I might do another example for this one day.

[4ian]

Closing as added through a PR