feat: variable player count

docs/changelogs/1.21.0.md

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+# BlitzKit 1.21.0
+
+Introducing the Tank performance tool!
+
+![](https://i.imgur.com/1TZzVnp.png)
+
+## Features
+
+- Added the Tank performance tool
+- The tankopedia search page now loads much faster
+  - Not all tanks are loaded at once; rather, more tanks are loaded as you scroll down the page
+
+## Fixes
+
+- The footer is now better centered