chore: release version 2.3.5 and refactor lobby

Bump export_presets.cfg version to 2.3.5. Update CHANGELOG_DRAFT.md.
Refactor lobby.gd into LobbyChat, LobbyMainMenu, LobbyRoomList, LobbyRoom.
Move Nakama config to environment variables in nakama_manager.gd.
Derive auth_manager.gd encryption key from OS.get_unique_id().sha256_text().
Remove Steam email auth fallback. Require auth ticket.
Make GachaManager.pull() async in gacha_panel.gd.
Remove dummy wallet seeding. Add store_type to IAP payload.
Validate IAP receipts server-side in economy.lua.
Register gacha module in main.lua.
Clean backend_service.gd stubs.
Fix featured_banners type safety in gacha_manager.gd. Guards non-array responses.
Move tiles_armagedon_a1.res to assets/models/meshes/. Fix import fallback_path.

addons/gut/comparator.gd

@@ -0,0 +1,125 @@
+var _strutils = GutUtils.Strutils.new()
+var _max_length = 100
+var _should_compare_int_to_float = true
+
+const MISSING = '|__missing__gut__compare__value__|'
+
+
+func _cannot_compare_text(v1, v2):
+	return str('Cannot compare ', _strutils.types[typeof(v1)], ' with ',
+		_strutils.types[typeof(v2)], '.')
+
+
+func _make_missing_string(text):
+	return '<missing ' + text + '>'
+
+
+func _create_missing_result(v1, v2, text):
+	var to_return = null
+	var v1_str = format_value(v1)
+	var v2_str = format_value(v2)
+
+	if(typeof(v1) == TYPE_STRING and v1 == MISSING):
+		v1_str = _make_missing_string(text)
+		to_return = GutUtils.CompareResult.new()
+	elif(typeof(v2) == TYPE_STRING and v2 == MISSING):
+		v2_str = _make_missing_string(text)
+		to_return = GutUtils.CompareResult.new()
+
+	if(to_return != null):
+		to_return.summary = str(v1_str, ' != ', v2_str)
+		to_return.are_equal = false
+
+	return to_return
+
+
+func simple(v1, v2, missing_string=''):
+	var missing_result = _create_missing_result(v1, v2, missing_string)
+	if(missing_result != null):
+		return missing_result
+
+	var result = GutUtils.CompareResult.new()
+	var cmp_str = null
+	var extra = ''
+
+	var tv1 = typeof(v1)
+	var tv2 = typeof(v2)
+
+	# print(tv1, '::', tv2, '   ', _strutils.types[tv1], '::', _strutils.types[tv2])
+	if(_should_compare_int_to_float and [TYPE_INT, TYPE_FLOAT].has(tv1) and [TYPE_INT, TYPE_FLOAT].has(tv2)):
+		result.are_equal = v1 == v2
+	elif([TYPE_STRING, TYPE_STRING_NAME].has(tv1) and [TYPE_STRING, TYPE_STRING_NAME].has(tv2)):
+		result.are_equal = v1 == v2
+	elif(GutUtils.are_datatypes_same(v1, v2)):
+		result.are_equal = v1 == v2
+
+		if(typeof(v1) == TYPE_DICTIONARY or typeof(v1) == TYPE_ARRAY):
+			var sub_result = GutUtils.DiffTool.new(v1, v2, GutUtils.DIFF.DEEP)
+			result.summary = sub_result.get_short_summary()
+			if(!sub_result.are_equal):
+				extra = ".\n" + sub_result.get_short_summary()
+	else:
+		cmp_str = '!='
+		result.are_equal = false
+		extra = str('.  ', _cannot_compare_text(v1, v2))
+
+	cmp_str = get_compare_symbol(result.are_equal)
+	result.summary = str(format_value(v1), ' ', cmp_str, ' ', format_value(v2), extra)
+
+	return result
+
+
+func shallow(v1, v2):
+	var result =  null
+	if(GutUtils.are_datatypes_same(v1, v2)):
+		if(typeof(v1) in [TYPE_ARRAY, TYPE_DICTIONARY]):
+			result = GutUtils.DiffTool.new(v1, v2, GutUtils.DIFF.DEEP)
+		else:
+			result = simple(v1, v2)
+	else:
+		result = simple(v1, v2)
+
+	return result
+
+
+func deep(v1, v2):
+	var result =  null
+
+	if(GutUtils.are_datatypes_same(v1, v2)):
+		if(typeof(v1) in [TYPE_ARRAY, TYPE_DICTIONARY]):
+			result = GutUtils.DiffTool.new(v1, v2, GutUtils.DIFF.DEEP)
+		else:
+			result = simple(v1, v2)
+	else:
+		result = simple(v1, v2)
+
+	return result
+
+
+func format_value(val, max_val_length=_max_length):
+	return _strutils.truncate_string(_strutils.type2str(val), max_val_length)
+
+
+func compare(v1, v2, diff_type=GutUtils.DIFF.SIMPLE):
+	var result = null
+	if(diff_type == GutUtils.DIFF.SIMPLE):
+		result = simple(v1, v2)
+	elif(diff_type ==  GutUtils.DIFF.DEEP):
+		result = deep(v1, v2)
+
+	return result
+
+
+func get_should_compare_int_to_float():
+	return _should_compare_int_to_float
+
+
+func set_should_compare_int_to_float(should_compare_int_float):
+	_should_compare_int_to_float = should_compare_int_float
+
+
+func get_compare_symbol(is_equal):
+	if(is_equal):
+		return '=='
+	else:
+		return '!='