restockMissile on playerships

[Piglit]

• Option to grant stations or ships the ability to automatically restock missiles on player ships.
• Previously it was only possible to restock missiles of cpuships.
• Change setRestockMissilesDockes from bool to enum that specifies who can restock missiles: None, cpuships, playerships, fighters, all.
• The 'fighters'-option automatically restocks missiles on internally docked ships. This is an easy way to provide missiles for player fighters from a carrier without the need for the fighters to dock on a station.
• New loading bar on the weapons screen indicates that restocking of missiles is in progress.
• If a playership provides missiles, the power of the missile-system in engineering determines the speed of the restocking.
• If a playership does not have missiles and does not provide missiles to docked ships, the missile-system in engineering is hidden.
• GM can select what type of docked ships will be provided with missiles (cpuships, playerships, fighters).
• Scenarios can set the option via a lua-function.