More visitors should come to the tavern if it is deemed safe

[X] I am running the latest alpha version of MineColonies for my Minecraft version.
[X] I checked the MineColonies/Structurize wiki and made sure that my issue is not covered there.
[X] I made sure that this change request is not a duplicate of any existing change request.

Is your feature request related to a problem?

Killing visitors doesn't leave any major results

When there hasn't been any death in the tavern, then visitors will deem the tavern safer and more will come.
For starter, the tavern will have a safety mechanic assigned to it. It start at 3 (The default) and slowly increase to 10, which is the maximum number.
If the tavern has a safety point of below 3, no visitors will show up, 3 is also automatically set when you finished building/upgrading you tavern.
With each passing days, the value is increased by 1.
Aristocrats and nobles will begin to visit once the safety value reached 5, furthermore, they may leave "tip" in your tavern block, including diamonds.
At 10, visitors will begin to visit other places in your colony and not just the tavern, but they can only visit some cartain building such as the townhall or the restaurant.
Everytime there is a fallen visitor in your tavern, the value will be dropped by 5
Each level of the Tavern has a maximum safety value: 1 - 3 2 - 6 3 - 10

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