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-ev/Makefile

@@ -0,0 +1,43 @@
+#
+# Copyright (C) 2019 Jianhui Zhao
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=lua-ev
+PKG_VERSION:=1.5
+PKG_RELEASE:=2
+
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
+PKG_SOURCE_URL:=https://codeload.github.com/brimworks/lua-ev/tar.gz/v$(PKG_VERSION)?
+PKG_HASH:=26ac116722a241bf59daf5315ce0ffe751c1babea9a146ffc0a389f1af3facca
+
+PKG_MAINTAINER:=Jianhui Zhao <jianhuizhao329@gmail.com>
+PKG_LICENSE:=MIT
+PKG_LICENSE_FILES:=LICENSE
+
+include $(INCLUDE_DIR)/package.mk
+include $(INCLUDE_DIR)/cmake.mk
+
+define Package/lua-ev
+  SUBMENU:=Lua
+  SECTION:=lang
+  CATEGORY:=Languages
+  TITLE:=lua-ev
+  URL:=https://github.com/brimworks/lua-ev
+  DEPENDS:=+lua +libev
+endef
+
+define Package/lua-ev/description
+  Lua integration with libev.
+endef
+
+define Package/lua-ev/install
+	$(INSTALL_DIR) $(1)/usr/lib/lua
+	$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/share/lua/cmod/ev.so $(1)/usr/lib/lua
+endef
+
+$(eval $(call BuildPackage,lua-ev))