[CSM] sound_play & sound_stop support + client_lua_api doc (#5096)

* squashed: CSM: Implement register_globalstep
  * Re-use fatal error mechanism from server to disconnect client on CSM error
  * Little client functions cleanups

* squashed: CSM: add core.after function
  * core.after is shared code between client & server
  * ModApiUtil get_us_time feature enabled for client

1 files changed, 36 insertions, 0 deletions

diff --git a/src/script/lua_api/l_sound.h b/src/script/lua_api/l_sound.h
new file mode 100644
index 000000000..86ba9087b
--- /dev/null
+++ b/src/script/lua_api/l_sound.h
@@ -0,0 +1,36 @@
+/*
+Minetest
+Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+Copyright (C) 2017 nerzhul, Loic Blot <loic.blot@unix-experience.fr>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#ifndef L_SOUND_H_
+#define L_SOUND_H_
+
+#include "lua_api/l_base.h"
+
+
+class ModApiSound: public ModApiBase
+{
+private:
+	static int l_sound_play(lua_State *L);
+	static int l_sound_stop(lua_State *L);
+public:
+	static void Initialize(lua_State *L, int top);
+};
+
+#endif