com.mbeddr.mpsutil.actionsfilter migration to MPS 2021.3.3

[KemalSoysal]

com.mbeddr.mpsutil.actionsfilter.ideaplugin looks unused and the class loading issue happened in MPS 2017.2.
From a first look, we should try to:

• remove*.ideaplugin
• remove the old idea plugin com.mbeddr.mpsutil.actionsfilter.lang
• merge the MPS and IntelliJ plugin and check if the class loading issue still persists. The extra XML IntelliJ platform declarations should hopefully also work in the MPS plugin nowadays.
• while we are at it: handle the missing IntelliJ plugin more gracefully when an action profile should activate than disabling many actions by accident and making MPS unusable.
  Changes to the plugin would also be a lot easier to make if we could just reload the changes models instead of having to reinstall the plugins.
• Add the missing ActionBase.refersToActionId implementation like in the RemoveAction_Behavior implementation

public virtual boolean refersToActionId(string id) 
   overrides ActionBase.refersToActionId { 
   return id != null && id.equals(this.actionId); 
}