Mod v0.4.2.1

1.New: Ctrl-A to select all items in the Window List dialog
2.New: Code performance improvement for Window list(Performance, menu blink and other issues)
3.New: Tip information about the file while mouse hovering over the file tab
4.Fix: Multiple selection does not work with Save/SaveAs(Windows List dialog) #193
5.Fix: Extra scroll issue while pressing enter key in Typewriter mode introduced by 0.4.2
6.Fix: Can't disable Autosave once enabled
7.Increase input area by decreasing right margin of the single line edit