Third round of updates for ToA (and demo). List includes only changes visible in demo.

Bug Fixes:

• Fixed invisible/wonky "Loading" message display when loading different levels.

Balance:

• Reduced Critical Hit Rating increase per Agility point from +0.8% to +0.5%
  

General:

• Reduced health orb mouse-over size

Meta:

• Updated manual to reflect mechanics changes.
• Filled out manual text a bit, including missing text.