New tool - arsenal reputation calculator

Added a new tool - Arsenal Reputation Calculator.

Use it to compare the costs of different options and find the most efficient way to level up your arsenal.

https://stalzone.wiki/en/arsenal

Other changes:

• all notifications are now displayed in a dedicated Notification Center;
• fixed an issue where the delay between shots was calculated incorrectly in the TTK Calculator.

We would also like to thank everyone who took part in our Build Calculator survey. We have already received more than 200 detailed responses - your feedback helps us better understand the issues users encounter and determine which features should be prioritized.

If you haven't taken the survey yet, we would greatly appreciate your feedback: https://stalzone.wiki/en/surveys/builds-calculator

Thank you for your feedback ❤️

See you again soon!