First step to SDL2

The character select screen shows the first user's character image.
Display all characters in "character select" screen
Manage window resize
[scr_select] vertical alignement
Introduce the virtual coordinate concept
Take virtual coordinate into account for mouse managment
Fix coordinate init
Implement smooth virtual coordiante change
Set loaded texture as STATIC
display character name and type on select screen
Right click launch the play screen
start to display the map
Set virtual coordinate on screen play
Add preiminary sprite drawing
better centering on sprite
Make sure the player's context is updated at each login
lock context list while drawing it
Remove commented code
Fix image loading
Smarter item list