Make event set extends from EventCallFrom.

This commit makes that events `hide`, `set` and `show` to extends from
`EventCallFrom`, allowing using an absolute node path to set values.
Fix #21

Author: AnidemDex

events/hide.gd

@@ -1,14 +1,19 @@
 tool
-extends Event
+extends "res://addons/event_system_plugin/events/call_from.gd"
 class_name EventHide
 
 func _init() -> void:
 	event_color = Color("EB5E55")
 	event_name = "Hide"
 	event_category = "Node"
 	event_icon = load("res://addons/event_system_plugin/assets/icons/event_icons/hidden.png") as Texture
+	method = "set"
+	args = ["visible", false]
+	event_preview_string = "{node_path}"
 
 
-func _execute() -> void:
-	event_node.set("visible", false)    
-	finish()
+func _get(property: String):
+	if property == "method_ignore":
+		return true
+	if property == "args_ignore":
+		return true

events/set.gd

@@ -1,5 +1,5 @@
 tool
-extends Event
+extends "res://addons/event_system_plugin/events/call_from.gd"
 class_name EventSet
 
 export(String) var variable_name:String = "" setget set_var_name
@@ -12,25 +12,28 @@ func _init() -> void:
 	event_icon = load("res://addons/event_system_plugin/assets/icons/event_icons/set_variable.png") as Texture
 	event_preview_string = "Set [ {variable_name} ] to be [ {variable_value} ]"
 	continue_at_end = true
-
-
-func _execute() -> void:
-	event_node.set(variable_name, variable_value)
-	finish()
+	method = "set"
+	args = ["",""]
 
 
 func set_var_name(value:String) -> void:
 	variable_name = value
+	args[0] = variable_name
 	emit_changed()
 	property_list_changed_notify()
 
 
 func set_var_value(value:String) -> void:
 	variable_value = value
+	args[1] = variable_value
 	emit_changed()
 	property_list_changed_notify()
 
 
 func _get(property: String):
 	if property == "continue_at_end_ignore":
 		return true
+	if property == "method_ignore":
+		return true
+	if property == "args_ignore":
+		return true

events/show.gd

@@ -1,14 +1,19 @@
 tool
-extends Event
+extends "res://addons/event_system_plugin/events/call_from.gd"
 class_name EventShow
 
 func _init() -> void:
 	event_color = Color("EB5E55")
 	event_name = "Show"
 	event_category = "Node"
 	event_icon = load("res://addons/event_system_plugin/assets/icons/event_icons/visible.png") as Texture
+	method = "set"
+	args = ["visible", true]
+	event_preview_string = "{node_path}"
 
 
-func _execute() -> void:
-	event_node.set("visible", true)    
-	finish()
+func _get(property: String):
+	if property == "method_ignore":
+		return true
+	if property == "args_ignore":
+		return true