Archmage skill corrections (#8120)

Corrections of several Archmage skills and High wizard skill HW_MAGICPOWER :
    AG_FROZEN_SLASH : 3 hits are displayed instead of a single hit.
    TargetType of 4th ground skills is now Ground. Ground skills don't trigger HW_SOULDRAIN. Skills affected :
        AG_VIOLENT_QUAKE_ATK
        AG_ALL_BLOOM_ATK
        AG_ALL_BLOOM_ATK2
        AG_CRYSTAL_IMPACT_ATK
        AG_ASTRAL_STRIKE_ATK
    Fixed cast time of HW_MAGICPOWER is not affected by item bonus anymore.

db/re/skill_db.yml

@@ -10125,6 +10125,7 @@ Body:
     FixedCastTime: 700
     CastTimeFlags:
       IgnoreDex: true
+      IgnoreItemBonus: true
     Requires:
       SpCost:
         - Level: 1
@@ -35597,7 +35598,7 @@ Body:
     Description: Violent Quake Attack
     MaxLevel: 5
     Type: Magic
-    TargetType: Attack
+    TargetType: Ground
     Range: 9
     Hit: Single
     HitCount: 1
@@ -35782,7 +35783,7 @@ Body:
     Description: All Bloom Attack
     MaxLevel: 5
     Type: Magic
-    TargetType: Attack
+    TargetType: Ground
     Range: 9
     Hit: Single
     HitCount: 1
@@ -35802,7 +35803,7 @@ Body:
     Description: All Bloom Attack 2
     MaxLevel: 5
     Type: Magic
-    TargetType: Attack
+    TargetType: Ground
     Range: 9
     Hit: Single
     HitCount: 1
@@ -35873,7 +35874,7 @@ Body:
     Description: Crystal Impact Attack
     MaxLevel: 5
     Type: Magic
-    TargetType: Attack
+    TargetType: Ground
     DamageFlags:
       Splash: true
     Hit: Single
@@ -36052,7 +36053,7 @@ Body:
     Description: Astral Strike Attack
     MaxLevel: 10
     Type: Magic
-    TargetType: Attack
+    TargetType: Ground
     Range: 9
     Hit: Single
     HitCount: 1
@@ -36241,8 +36242,8 @@ Body:
     TargetType: Self
     DamageFlags:
       Splash: true
-    Hit: Single
-    HitCount: 1
+    Hit: Multi_Hit
+    HitCount: -3
     Element: Water
     SplashArea:
       - Level: 1