lua: move Lua packages under lang/lua sub-folder

There are roughly 50 Lua packages.
It's about time we consider a proposal for moving all of them
under a lang/lua sub-folder.

Signed-off-by: Alexandru Ardelean <alex@shruggie.ro>

lang/lua/lua-argparse/Makefile

@@ -0,0 +1,49 @@
+#
+# Copyright (C) 2006-2020 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=lua-argparse
+PKG_VERSION:=0.7.1
+PKG_RELEASE:=1
+
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
+PKG_SOURCE_URL:=https://codeload.github.com/luarocks/argparse/tar.gz/$(PKG_VERSION)?
+PKG_HASH:=d344e49404c3e7b3e7fa4fe6741c106f25909d9b24923cb08dcceda1f9754809
+PKG_BUILD_DIR:=$(BUILD_DIR)/argparse-$(PKG_VERSION)
+
+PKG_MAINTAINER:=Vladimir Malyutin <first-leon@yandex.ru>
+PKG_LICENSE:=MIT
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/lua-argparse
+        SUBMENU:=Lua
+        SECTION:=lang
+        CATEGORY:=Languages
+        TITLE:=lua-argparse
+        URL:=https://github.com/mpeterv/argparse
+        DEPENDS:=+lua
+        PKGARCH:=all
+endef
+
+define Package/lua-argparse/description
+        Argparse is a feature-rich command line parser for Lua inspired by argparse for Python.
+endef
+
+define Build/Configure
+endef
+
+define Build/Compile
+endef
+
+define Package/lua-argparse/install
+	$(INSTALL_DIR) $(1)/usr/lib/lua
+	$(INSTALL_DATA) $(PKG_BUILD_DIR)/src/argparse.lua $(1)/usr/lib/lua/
+endef
+
+$(eval $(call BuildPackage,lua-argparse))