Add seed selection on the command line

Now random-generator seed can be forced to replay a match.
Use 'log' method in embtest and replace test_handler by handler_dummy

HandlerDummy does exactly nothing.
Replace all tabs by 4 spaces.

Now coding style is: one indent = four spaces, no tabs.
Add StatManager object and update renderer_interface

StatManager computes all global data in the game.
Update items hierarchy to add StatManager access for all items
Add missile and mineral stat update in items

Now stats are well computed and displayed.
Add new stat_manager.[hc]pp files
Merge branch 'master' into renderer

Conflicts:
	renderer_sdl_draw.cpp
	renderer_sdl_draw.hpp
Add selection of items by mouse click and filtered logging

Log info are only printed for selected items.
Add stats display on the right side and remove debugging info on each item
First version of the console for printing logs
Finalize console integration in the SDL renderer
Implement screen resize

Now need world navigation.
Add viewport to drag the view with mouse
Add zoom to the SDL renderer and mouse position

Also fix debug mode for bases and print debug information for selected items.