feat: player.delete() function and update documentation

src/logic/scripting/lua/libs/libplayer.cpp

@@ -279,6 +279,11 @@ static int l_create(lua::State* L) {
     return lua::pushinteger(L, player->getId());
 }
 
+static int l_delete(lua::State* L) {
+    level->players->remove(lua::tointeger(L, 1));
+    return 0;
+}
+
 const luaL_Reg playerlib[] = {
     {"get_pos", lua::wrap<l_get_pos>},
     {"set_pos", lua::wrap<l_set_pos>},
@@ -310,5 +315,6 @@ const luaL_Reg playerlib[] = {
     {"get_name", lua::wrap<l_get_name>},
     {"set_name", lua::wrap<l_set_name>},
     {"create", lua::wrap<l_create>},
+    {"delete", lua::wrap<l_delete>},
     {NULL, NULL}
 };