Currently it will be used only for the movement hint, but I choose a
general name, in case of other uses.
There is 11 colors, each one for each 10 intervals and the last one
for the maximum.
I kept my previous colors: pure yellow for 50% and subtract multiple
of 50 in red or green for other values.
* check game.cfg (currently inside _main.cfg) and preferences.cfg for
server lists instead of using a hard-coded list of official servers.
* added help strings to the View Server List dialog
"_image" suffix and add an apparantly never used hardcoded default
values, even if the cfg doesn't define one
the new keys are grid_image, unreachable_image, void_image, fog_image
and tod_bright_image
when starting the editor
This seems to greatly improve the editor start time
Also use it to skip editor-groups.cfg when starting the game
Adding a GAME tag is probably nicer, but seems a bit more complex
