Integrated STP with Category Support

[Spikey84]

This PR integrates @4z0t's ui mod called Specific Target Priorities to the game. This mod allows a player to select with a hotkey the kind of unit they with their units to target. In addition to integrating the current mod i am also making modifications that will allow the targeting of all variations of units (different factions) without selecting each on individually.

[Spikey84]

Things to do here:

• Add default TP hotkey
• Make hotkey look cleaner
• Finish/rework the category table
• check with @Garanas that performance is not effected by this change

[MrRowey]

@Spikey84 I set Hotkey to Units to P and this is my error that i get

[Spikey84]

@MrRowey do u have ATP and/or STP?

[Garanas]

You can set the target priority to units of yourself, which isn't necessarily a bad thing but just wanted to point it out.

The code needs some fail safes (for modded units, in particular) when a certain field does not exist. Take the command unit, it has no tech level.

[Garanas]

As a few examples:

{ -- Shield disruptor
  categories.dal0310, 
  categories.TECH3 * categories.AEON * categories.DIRECTFIRE * categories.LAND, 
  categories.TECH3 * categories.DIRECTFIRE * categories.LAND, 
  categories.DIRECTFIRE * categories.LAND, 
  categories.LAND
}

{ -- Janus
  categories.dea0202, 
  categories.TECH2 * categories.UEF * categories.ANTIAIR * categories.AIR, 
  categories.TECH2 * categories.ANTIAIR * categories.AIR, 
  categories.ANTIAIR * categories.AIR, 
  categories.AIR
}

{ -- Bouncer
  categories.dal0310, 
  categories.TECH3 * categories.AEON * categories.DIRECTFIRE * categories.LAND, 
  categories.TECH3 * categories.DIRECTFIRE * categories.LAND, 
  categories.DIRECTFIRE * categories.LAND, 
  categories.LAND
}

The logic can be found in the changes, but roughly:

• unit id that we hover over
• common categories that the unit we hover over may share with similar units, including faction
• common categories that the unit we hover over may share with similar units
• common categories that the unit we hover over may share with similar units of any tech
• common categories that the unit we hover over may share with similar units of the same layer