Device slot improvements

[exinfinitum]

• Add ability to install devices to device slots by ID
• Enable "force install to device slot" option in shpInstallDevice objCanInstallItem to check installation of items to device slots taking into account criteria, maxMass, maxPower, maxPowerPercentage fields and prevent installation if these conditions are not met (also allow installation into unoccupied device slots)
• Add similar checks to shpCanInstallDevice
• Add description, attributes, maxMass, maxPower and maxPowerPercentage fields to deviceSlots
• Add new options to objGetProperty to enable getting device slot info

[exinfinitum]

Implementing targetCriteria support will be quite a bit more complicated. We may want to leave that as well as the ability to specify targetCriteria in weapon xml definitions to another PR, and just merge the current feature set as is for this PR.

[exinfinitum]

TODO: Remove force install to device slot for shpInstallDevice. Do not remove this argument from objCanInstallItem.

[exinfinitum]

TODO: Fix exception when accessing device at slot for ships with devices assigned to specific slot IDs.

[FlufflesTheMicrosaur]

This PR can be safely closed since #246 will be able to act as an up-to-date reference until implementation of the desired features is completed

[ArisayaDragon]

Closing this as we have an updated reference PR, and george decided not to take these changes as-is