feat: Add opened_at and closed_at properties to Polls

Those are timestamps, ie. seconds since UNIX EPOCH
UNIX EPOCH is 01-01-1970
The information era has entered its jubilee! \o/

addons/majority_judgment/MajorityJudgmentPoll.gd

@@ -7,9 +7,14 @@ gives a single grade to each of the candidates.
 The candidates are then sorted by their median grade.
 
 https://en.wikipedia.org/wiki/Majority_Judgment
-The constitutive details of the poll are up to you.
+The constitutive details of the poll are up to you, of course,
+the poll can be imperative or informative.
 """
 
+const NOT_OPENED := -1
+const NOT_CLOSED := -1
+
+
 # Minimum length: 4 unicode characters (? TBD)
 # Maximum length: 256 unicode characters (? TBD)
 export(String) var title:String setget set_title, get_title
@@ -36,6 +41,10 @@ export(Array, Resource) var candidates:Array setget set_candidates, get_candidat
 export(Array, Resource) var judgments:Array setget set_judgments, get_judgments
 
 
+# Seconds since UNIX EPOCH (01-01-1970)
+export var opened_at:int = NOT_OPENED
+export var closed_at:int = NOT_CLOSED
+
 
 # Don't pass parameters in _init().
 # ResourceLoader.load() won't like it.
@@ -43,7 +52,7 @@ func _init():
 	pass
 
 
-# Instead, use a factory approach
+# Instead, use a factory approach.
 static func make(__title, __grading, __candidates):
 	var poll = load("res://addons/majority_judgment/MajorityJudgmentPoll.gd").new()
 	poll.set_title(__title)
@@ -52,7 +61,6 @@ static func make(__title, __grading, __candidates):
 	return poll
 
 
-
 func set_title(__title:String) -> void:
 	title = __title
 
@@ -116,6 +124,24 @@ func get_judgments() -> Array:
 	return judgments
 
 
+func is_open() -> bool:
+	var now = App.get_now()
+	return (
+		(NOT_OPENED != opened_at and opened_at <= now)
+		and
+		(NOT_CLOSED == closed_at or closed_at >= now)
+	)
+
+
+func is_closed() -> bool:
+	return not is_open()
+
+
+func open() -> void:
+	assert(NOT_OPENED == opened_at, "Cannot open() an already opened poll.")
+	opened_at = App.get_now()
+
+
 func tally() -> MajorityJudgmentPollTally:
 	if not has_judgments():
 		return null

addons/majority_judgment/providers/MajorityJudgmentAbstractJudgmentsProvider.gd

@@ -13,6 +13,7 @@ class_name MajorityJudgmentAbstractJudgmentsProvider
 # - IRC chat commands (low, as a bot would be better)
 # - Discord, somehow
 # - Riot, Jami, etc.
+# - SMS
 # - Heck, any videoconferencing software with a workable API
 # 
 # So far, providers don't care about whether the candidate or grade indices

addons/majority_judgment/providers/MajorityJudgmentChatCommandJudgmentsProvider.gd

@@ -35,7 +35,7 @@ class_name MajorityJudgmentChatCommandJudgmentsProvider
 
 func process_chat_command(author_identifier:String, chat_command:String):
 	var regex = RegEx.new()
-	regex.compile("(?<candidate>[a-zA-Z]{1})(?<grade>[0-9]{1})")
+	regex.compile("(?<candidate>[a-zA-Z]{1,2})(?<grade>[0-9]{1,2})")
 	
 	var results = regex.search_all(chat_command)
 	if results:

addons/majority_judgment/providers/MajorityJudgmentTwitchChatProvider.gd

@@ -54,6 +54,10 @@ func start_providing():
 	var _c = self.twitch.connect("message_received", self, "_on_message_received")
 
 
+func stop_providing():
+	pass
+
+
 func _on_message_received(user_name:String, text:String, emotes:Array):
 	# I. Log it to file
 	var log_filepath = "user://twitch_chat_%s.log" % [