Memory leak when executing scripts in a loop dynamically in process

[gimatech]

Hello,

Calling the ScriptRunner Execute method in a loop leads to a memory leak due to the fact the event AppDomain.CurrentDomain.AssemblyResolve (subscribed in ScriptCompiler is never unsubscribed.

I didn't find a workaround for this

[stevehansen]

Fix seems easy enough (I started my fork for the changes stevehansen@6f295e2) but we are also seeing if it is possible to use the .NET core assembly unloading https://docs.microsoft.com/en-us/dotnet/standard/assembly/unloadability

[filipw]

Fixed in #630