Upgrade to .net 5.0; "CanJump" cache added.

[mingl0280]

Unfortunately, I have to upgrade this thing to .Net 5.0 otherwise my VS2022 wouldn't open it. Added a "CanJump" cache class to cache the queries every 10 minutes. This function causes a lot of lag when editing recipes, as it can't find the target but it tries too many times when editing the available recipes.