better nxtlvl xp txt; added a project complete modial;

Project complete modial added, inspires me to start adding a z-index to
these modials (hmmm....). Also, on the usability side, the next level xp
bar is much more clear and readable. Next up is like a modial/message
manager, as I am now realizing these modials are going to be integral to
the game. Maybe thinking of having random other messages in smaller,
less abrupt popups somewhere on screen.