sc2: Sentry class war council upgrades

[MatthewMarinets]

Adding the sentry-class war council upgrades:

• Sentry Double Shield Recharge -- nerfed sentries only heal one target at a time, war council targets 2
• Energizer Mobile Chrono Beam -- nerfed Energizers can only chrono beam in phasing mode, war council lets them chrono in mobile mode
• Havoc Enduring Sight -- nerfed Havocs have to activate Squad Sight for energy, similar to guardian shell. War Council lets them keep it up indefinitely for free.

Progress on #152 Pairs with client PR #250

Sentry

Without upgrade: With upgrade:

Energizer

Without upgrade:

With upgrade:

Havoc

Without upgrade: *Note the red squad sight circle is active here, I just timed the picture poorly and it's between pulses.

With upgrade:

[MatthewMarinets]

Cleared the range indicator without squad sight:

Got it coming back when the upgrade is researched, but I couldn't figure out how to get the range indicator to show up for when the ability is active and the unit is already selected.

[MatthewMarinets]

Did autocast, tested and it worked... okay? The issue is there's no validator for if a unit is ranged, so the squad sight will trigger if any nearby friendly unit enters combat. I set the range down by 0.5 in the hopes it will be slightly less likely to trigger on melee units that immediately charge away (guardian shell uses 4.5 validator range for a 4 range ability). I suppose it doesn't have to be perfect as it's opt-in autocast