Context-based Combat Fixes

Series of Fixes for bugs and issues that came up during the last few code cleanup PRs.

 * Sets human damage bonus back to 3 (why it ever got set to 0 is beyond me).
 * Fixes an attackeded
 * Adds description of current hit chances
 * Fixes show_attack proc by relocating the position where species.unarmed_attack.attack gets added
 * Makes use of damage_multiplier again