Add weapon readiness

[kenfar]

A weapon in hand can have 3 readiness statuses:

• ready - can be used immediately in combat
• not ready - not ready for combat
• readying - in process of being readied

Examples:

• a bow may require some number of segments (say 4) to reload before it can fire again
• a heavy crossbow may require 1 or 2 full rounds before it can fire again. While reloading it is in 'readying' status.