Enhancement: add a global GTM option to not output spaces at end of chords

[jdestgermain]

Is your feature request related to a problem? Please describe.
This is a very common request for some other languages and programmers

[jdestgermain]

John's thoughts:

Add a new explicit action code that can be included with any chord output to not include a space at the end

Add a new GTM setting to append aforementioned action code on every output when "no spaces" or whatever is turned on

Add a new action code for toggling the value of the above GTM setting so that users can create custom keybinds to toggle on the fly, like spurring: but #68 looks like maybe a better method if easy to use?