Load images for EtherCAT extension

Fixes following backtrace:

Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/wx-3.0-gtk3/wx/_core.py", line 16765, in <lambda>
lambda event: event.callable(*event.args, **event.kw) )
File "/home/developer/WorkData/PLC/beremiz/beremiz/BeremizIDE.py", line 1074, in AddConfNode
self._Refresh(TITLE, FILEMENU, PROJECTTREE)
File "/home/developer/WorkData/PLC/beremiz/beremiz/IDEFrame.py", line 917, in _Refresh
self.RefreshFunctions[element]()
File "/home/developer/WorkData/PLC/beremiz/beremiz/IDEFrame.py", line 1526, in RefreshProjectTree
self.GenerateProjectTreeBranch(root, infos)
File "/home/developer/WorkData/PLC/beremiz/beremiz/IDEFrame.py", line 1565, in GenerateProjectTreeBranch
self.GenerateProjectTreeBranch(item, values)
File "/home/developer/WorkData/PLC/beremiz/beremiz/IDEFrame.py", line 1554, in GenerateProjectTreeBranch
self.TreeImageDict[icon_name] = self.TreeImageList.Add(GetBitmap(icon_name))
File "/usr/lib/python2.7/dist-packages/wx-3.0-gtk3/wx/_gdi.py", line 6735, in Add
return _gdi_.ImageList_Add(*args, **kwargs)
ValueError: invalid null reference in method 'ImageList_Add', expected argument 2 of type 'wxBitmap const &

/* Beremiz' header file for use by extensions */

#include "iec_types.h"

#define LOG_LEVELS 4
#define LOG_CRITICAL 0
#define LOG_WARNING 1
#define LOG_INFO 2
#define LOG_DEBUG 3

extern unsigned long long common_ticktime__;

#ifdef TARGET_LOGGING_DISABLE
#define LogMessage(level, buf, size)
#else
int     LogMessage(uint8_t level, char* buf, uint32_t size);
#endif

long AtomicCompareExchange(long* atomicvar,long compared, long exchange);