Add `plf_hive` package (#3752)

* Add `plf::hive`

* Fix failing tests for C++20.

* >.< Forgot <version> header.

* Update xmake.lua

---------

Co-authored-by: star9029 <[email protected]>

packages/p/plf_hive/xmake.lua

@@ -0,0 +1,16 @@
+package("plf_hive")
+    set_kind("library", {headeronly = true})
+    set_homepage("https://plflib.org/colony.htm")
+    set_description("plf::hive is a fork of plf::colony to match the current C++ standards proposal.")
+    set_license("zlib")
+
+    add_urls("https://github.com/mattreecebentley/plf_hive.git")
+    add_versions("2024.04.21", "7689475b1fa2a95228cf0f44db9c209d7e430748")
+
+    on_install(function (package)
+        os.cp("plf_hive.h", package:installdir("include"))
+    end)
+
+    on_test(function (package)
+        assert(package:has_cxxtypes("plf::hive<int>", {configs = {languages = "c++20"}, includes = "plf_hive.h"}))
+    end)