[mon_hmi/gtk;gtkviewer] Adds ability to draw strings on buffer
* UTF-8 strings may be drew to the buffer
* Uses iconv for UTF-8 interpretation and freetype for font rendering
* Draw obstacles identifiers
[mon_hmi/gtk] Removes unused param + adds --win-factor
[main_ia] Minor changes, typos + adds time stats to fill_tgts_lnk
[mon_hmi/gtk;main_ia] Minor changes + initial position
[main_ia/A*] Fixes again A* implementation (some other rare cases)
* Reuse predetermined relation between pair of obstacles
* check_arc and fill_tgts_lnk have now consistent data
Merge branch 'dev_linux_ia' of https://github.com/ENAC-Robotique/Robots into dev_linux_ia

Conflicts:
	primary_robot/main_ia/obj_tools/obj.c