[refactor] all the classes earlier in odemis.gui.comp.stream.py have…

… been split into individual python files.

The stream file has been split into stream_bar and stream_panel files. The fastem specific code unrelated to the stream has also been sperated.

src/odemis/gui/comp/_constants.py

@@ -0,0 +1,33 @@
+# -*- coding: utf-8 -*-
+"""
+:author: Rinze de Laat <laat@delmic.com>
+:copyright: © 2012-2021 Rinze de Laat, Philip Winkler, Delmic
+
+This file is part of Odemis.
+
+.. license::
+    Odemis is free software: you can redistribute it and/or modify it under the terms of the GNU
+    General Public License version 2 as published by the Free Software Foundation.
+
+    Odemis is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
+    even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+    General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along with Odemis. If not,
+    see http://www.gnu.org/licenses/.
+
+This module contains classes needed to construct stream panels.
+
+Stream panels are custom, specialized controls that allow the user to view and manipulate various
+data streams coming from the microscope.
+
+"""
+
+import wx.lib.newevent
+
+# Used by StreamPanel and StreamBar
+stream_remove_event, EVT_STREAM_REMOVE = wx.lib.newevent.NewEvent()
+
+# Used by FastEMProjectPanelHeader and StreamPanelHeader
+CAPTION_PADDING_RIGHT = 5
+ICON_WIDTH, ICON_HEIGHT = 16, 16