Create custom RulePackDefs for CE verbs

[Alicecomma]

This can be done for many of the verbs and under several circumstances.

• Fragments should have a rulepackdef similar to Combat_ExplosionImpact, taking into account hitting oneself and such, ignoring the case where the target is not a pawn or turret.
• Bullets should have a rulepackdef similar to Combat_RangedFire, Combat_RangedDamage, Combat_RangedMiss taking into account that one projectile could miss many things and still hit something down the line.
• Melee should have rulepackdefs for dodging, missing, critical hits etcetera. [implemented in-code but not accounted for in rulepackdefs - e.g a dodge/miss/crit is currently written down in the log as a normal hit]
• Marking for artillery fire should have a combat log rulepackdef.

[Alicecomma]

XML: RulePackDefs should be written as indicated. See "RulePackDefs/DamageEvent_CookOff.xml" C#: new RulePackDefs should be referenced instead of vanilla RulePackDefs. See "Projectiles/BulletCE.cs":

//The following code excludes turrets etcetera from having cook off projectile impacts recorded in their combat log.
//If it is necessary to add cook off to turret logs, a new BattleLogEntry_ must be created, because BattleLogEntry_DamageTaken,
//which is the only method capable of handling cookoff and only using pawns, can not take !(hitThing is Pawn).
if (cookOff && hitThing is Pawn)
{
    logEntry =
        new BattleLogEntry_DamageTaken(
            (Pawn)hitThing,
            DefDatabase<RulePackDef>.GetNamed("DamageEvent_CookOff"));
    Find.BattleLog.Add(logEntry);
}