More sanitizers, fixes several errors caught by these.

tests/ListTests.cpp

@@ -64,12 +64,11 @@ TEST_CASE("Test IndexOf") {
     CHECK(ls.IndexOf(5) == 0);
     CHECK(ls.IndexOf(1500) == 2);
     CHECK(ls.IndexOf(300) == 5);
-    CHECK(ls.IndexOf(684) == -1);
+    CHECK_FALSE(ls.IndexOf(684).has_value());
 }
 
 TEST_CASE("Test list out of bounds") {
     auto ls = List<int>({5, 200, 1500, -500, 5, 300, -500});
-    REQUIRE_THROWS(ls.At(-1));
     REQUIRE_THROWS(ls.At(7));
 }
 

tests/UniquePtrListTests.cpp

@@ -47,7 +47,6 @@ TEST_CASE("Test unique ptr list out of bounds") {
     auto v2 = new uint32_t(5000);
     ls.Append(v1);
     ls.Append(v2);
-    REQUIRE_THROWS(ls.At(-1));
     REQUIRE_THROWS(ls.At(2));
 }