set default mass and energy values to be basically infinite, so that the levels need to specify different values
We can get starting values from the map now. TODO: get them from the wave; see issue #63
first tutorial level has enough mass for one laser tower and enough energy for it to shoot all enemies.
default values are like they used to be, but now we can override them in the .ini files
Merge branch 'feature/issue/#103_Starting_resources_should_be_specified_by_levels' into develop