Renaming and cleanup. Begin to use own small arena allocator

mROA.Test/ConcurrentTest.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Threading.Tasks;
+using mROA.Implementation;
+
+namespace mROA.Test;
+
+[TestFixture]
+public class ConcurrentTest
+{
+    private CircularMemoryManager _cmm;
+    
+    [SetUp]
+    public void Setup()
+    {
+        _cmm = new CircularMemoryManager(100);
+    }
+
+    [Test]
+    public void ParallelAlloc()
+    {
+        Parallel.For(0, 100, i =>
+        {
+            var data = _cmm.AllocSlice(1);
+            data.Span[0] = 1;
+        });
+
+        var total = _cmm.AllocSlice(100).Span;
+        if (total.IndexOf((byte)0) == -1)
+        {
+            Assert.Pass();
+        }
+        Assert.Fail();
+    }
+}