Do not use electron's remote in event handlers

[alexdima]

See #2829

[bpasero]

I have pushed changes to greatly reduce use of remote in the renderer. One of the few things I left out for now is the context menu which I extracted into #3638. I pushed a change though to use a timeout of 0 to make sure that we are not using remote from event handlers.

Areas to verify:

• most importantly: the bug with pressing "Tab" getting wrong is not happening anymore
• toggle dev tools
• reload window
• mac: shows "represented" file name in window title area when opening files and removes it when closing last editor
• mac: window shows as "dirty" when having dirty files by drawing a black dot in the close button of the window and removes this dot when no more dirty files are present
• save dialog still works and shows up for dirty files when closing workbench or closing the working file
• going full screen, leaving full screen
• toggling menu bar visibility
• context menu still works (in trees, editor, dropdown "...")

[alexdima]

Nice!!

[alexdima]

I didn't start reviewing the commit, I trust you do the right thing. Thank you!

[bpasero]

I feel honoured ;)