Implement TramplesMinimize as a move flag (#175)

* Implement "TramplesMinimize" as a move flag

Implemented `TramplesMinimize` as a move flag. Due to it, removed effect codes `FlinchTargetTrampleMinimize` and `ParalyzeTargetTrampleMinimize` (the second one was exclusive to Body Slam). Moves that had them now have the effect codes `FlinchTarget` and `ParalyzeTarget`, respectively.

The code now does not check if the parameter of `tramplesMinimize?` is 1 or 2, it now checks if it is `true` or `false`. For the effect that causes the moves with this flag to skip accuracy checks, it also checks if `Settings::MECHANICS_GENERATION` is equal to or greater than 6.

Data on which moves are to be treated as able to double damage if Minimized and skip accuracy checks are [here](https://bulbapedia.bulbagarden.net/wiki/Minimize_(move)#Vulnerability_to_moves).

**Remarks:**
- Dragon Rush, Heat Crash and Heavy Slam could not trample Minimize in Gen 5. Dragon Rush and Heat Crash could do so in Gen 6+, but Heavy Slam could not until Gen 7.
- Double Iron Bash could only trample Minimize in Gen 7.

**TL;DR:**
- Implemented `TramplesMinimize` as a move flag.
- Modified the check for this move flag.
- Removed effect codes `FlinchTargetTrampleMinimize` and `ParalyzeTargetTrampleMinimize`. Moves that had them now have the effect codes `FlinchTarget` and `ParalyzeTarget`, respectively.

Data/Scripts/011_Battle/003_Move/009_MoveEffects_MultiHit.rb

@@ -15,13 +15,11 @@ class Battle::Move::HitTwoTimesPoisonTarget < Battle::Move::PoisonTarget
 end
 
 #===============================================================================
-# Hits twice. Causes the target to flinch. Does double damage and has perfect
-# accuracy if the target is Minimized. (Double Iron Bash)
+# Hits twice. Causes the target to flinch. (Double Iron Bash)
 #===============================================================================
 class Battle::Move::HitTwoTimesFlinchTarget < Battle::Move::FlinchTarget
-  def multiHitMove?;                return true;                                end
-  def pbNumHits(user, targets);     return 2;                                   end
-  def tramplesMinimize?(param = 1); return Settings::MECHANICS_GENERATION <= 7; end
+  def multiHitMove?;            return true; end
+  def pbNumHits(user, targets); return 2;    end
 end
 
 #===============================================================================