Improved formatting and rules update

While a minor update, this is a big improvement.

First, the formatting of the rules is better and easier to read. The one page constraint makes it a challenge to format the rules so they all fit, but is still readable.

Second, there were some minor rules changes, which also improve playability.

• Shields now provide 1-3 blocks.
• Armor now has 3 levels: Basic, Advanced, Next Level. This uses the same terminology for armor as other things like items
• The roll to see if magic cast points are reduced is now less than the effort instead of less than or equal.

The solo game was updated to use the same rules as explained above, improve formatting, and to fix a couple of typos. Also, determining the danger level of the 5+ Room Dungeon Generator was updated to use the same rules as the stand alone 5+ Room Dungeon Generator.