Adjusted tables, balance changes

Changelog:

• All rolling tables now use d100.
• Trader now sells Transmutative Reagent.
• Added description for Venom and Shadowbind potions.
• Simultaneous combat damage clarification.
• Healing Potion heal reduced to 3 HP.
• Makeshift Buckler now absorbs -1 DMG instead of blocking all incoming damage from an attack.
• The Search action reveals travelling trader on SH.
• Undying flame healing increased 7-->9.
• Improved the wording of Incantations.
• Other minor fixes.