Move minds, roles, jobs and objectives to shared (#19679)

Content.Shared/Players/SharedPlayerSystem.cs

@@ -0,0 +1,12 @@
+using Robust.Shared.Players;
+
+namespace Content.Shared.Players;
+
+/// <summary>
+///     To be used from some systems.
+///     Otherwise, use <see cref="ISharedPlayerManager"/>
+/// </summary>
+public abstract class SharedPlayerSystem : EntitySystem
+{
+    public abstract PlayerData? ContentData(ICommonSession? session);
+}