v1.12.4.1

-- Step 1 in effort to clean up and simplify main GUI: a) get rid of needless guiControls structure. b) Use GUI object handles to get GUI parameters for simple parameters as much as possible. c) Move all files out of needless GuiMain/AxesData and GuiMain/AxesSDG folders in preparation for totally deleting them.
-- Fix minir issue in MenuBox where we incorrectly get the handle of the parent GUI.
-- Fix minor issue in DataFilesClass where we don't handle a prefix of '.' in front of the format name such as '.snirf' or '.nirs' should be converted to 'snirf' and 'nirs'.
-- Add standardized help sections for helper GUIs: StimEditGUI, ProcStreamEditGUI and PlotProbeGUI and ProcStreamOptionsGUI.