Update .net version of all projects#2

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DavidFidge wants to merge 4 commits intoEraclys:masterfrom

DavidFidge:master

Commits on Feb 23, 2022

Update BehaviourTree so that it supports the following target frameworks: .net standard 2.1, core 3.1, .net 5 and .net 6.
David Fidge
committed

Commits on Dec 27, 2022

Update all nuget packages in the solution.
David Fidge
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Commits on Feb 18, 2023

Change projects to .net 6 only.
David Fidge
committed

Commits on Jan 15, 2025

update to .net 8
DavidFidge
committed