object.txt should accept random values

[MarbleDice]

Allow the specification of values in object.txt, for pval, to-hit, to-dam, and to-armor, of the following format:

5+2d6M8

Where 5 is a constant base, 2d6 is a damroll, and M8 is m_bonus(8). The base, the damroll, just the number of dice, and the m-bonus parameter are all optional. A leading negative sign should invert the entire value. This would have several nice benefits:

• Allow re-balancing of object bonuses without recompiling
• Allow weapon/armor bonuses to be balanced on a per-sval basis
• Remove significant hard-coding in object/obj-make.c
• May simplify auto-identify on jewelry or other objects

[MarbleDice]

Implemented in [ed7af42] (SVN r1837).

[MarbleDice]

[b4e1543] (SVN r1843) includes some fixes:

• Properly compute average calculation for m_bonus
• Don't display timeout for items that don't use them but have effects
• Style and standards fixes:
  • Define parse_random_value() as a static function
  • Properly typedef/define random_value struct
  • Use string tokenization instead of non-ANSI scan sets %[]

[MarbleDice]

[c29c9ee] (SVN r1848) uses a random_value to handle object stack size

[MarbleDice]

[e1fee37] (SVN r1850) extends random_value to the ego item bonus fields.