Fix Heretic single damage-only focus spells (#233)
* Make Util non-static
Change extension method calls to regular method calls for: Util.Foreach, .AddRange, .SplitCSV
Remove extension status from methods: Util.Foreach, .AddRange, .Shuffle, .ContainsKey and .SplitCSV
Make Util non-static
Make Util singleton
* Make Util.Random(Double) fakeable
Make Util.Random(Double) fakeable so unit tests can be created deterministic
* Cleanup noise in HereticDamageLostOnPulse
Remove commented out code
Remove unused using statements
* Make LanguageMgr non-static
Remove extension status from LanguageMgr.GetTranslation
Remove extension status from LanguageMgr.TryTranslateOrDefault
Make LanguageMgr a singleton
* Make LanguageMgr.TryGetTranslation fakeable
Extract method body to TryGetTranslationImpl
Make TryGetTranslationImpl non-static, virtual and protected
* Make LanguageMgr initializable in tests
Make LangPath init lazy (only assigned when called)
Make LangPath fakeable (via LangPathImpl)
* Add three tests to HereticDoTLostOnPulse
Override GetPlayersInRadius in FakePlayer and FakeNPC
Override ResetCombatTimer in FakePlayer
Add FakeRegion and FakeRegionData
Override CurrentRegion in FakePlayer and FakeNPC to return FakeRegion
Add MockPlayer in HereticFocusSpells unit tests to sense lastDealtDamage
* Fix Damage of HereticDamageLostOnPulse
Changed growth to be dependent on spell.LifeDrainReturn table column
Added growth_cap (dependent on spell.AmnesiaChance table column)
Changed growth of damage to be linear rather than exponential
* Add duration limit to HereticDamageLostOnPulse
