Optimize overall memory usage

* Fixes in otbm loader
* Rework BinaryTree

src/framework/luaengine/luainterface.cpp

@@ -721,7 +721,10 @@ void LuaInterface::error()
 
 int LuaInterface::ref()
 {
-    return luaL_ref(L, LUA_REGISTRYINDEX);
+    int ref = luaL_ref(L, LUA_REGISTRYINDEX);
+    assert(ref != LUA_NOREF);
+    assert(ref < 2147483647);
+    return ref;
 }
 
 int LuaInterface::weakRef()

src/framework/luaengine/luaobject.h

@@ -27,6 +27,7 @@
 
 /// LuaObject, all script-able classes have it as base
 // @bindclass
+#pragma pack(push,1) // disable memory alignment
 class LuaObject : public std::enable_shared_from_this<LuaObject>
 {
 public:
@@ -88,6 +89,7 @@ private:
     int m_fieldsTableRef;
     int m_metatableRef;
 };
+#pragma pack(pop)
 
 #include "luainterface.h"