Adding Command Buttons: Change Way Title Is Computed

[tbpassin]

When leointeg creates a button from a script node, it copies the node's headline as the button title, with some truncation. Some of the scripts I want to turn onto a button start with @command. The button title should not include strings like that since they take up space and obscure the meaning. E.g., a node whose headline is:

@command change-widget-by-this-very-long-command @key=ctrl-x

should have a button title like:

change-widget-by-this-very-long-co

So please:

1. Remove Leo directives from button titles;
2. Truncate button titles to a longer length. There is plenty of potential length available.

[boltex]

Thanks for noticing this! Will do! 😁

[boltex]

After fixing #173 and #178, I tried what happens with that in plain old Leo (thinking I was about to fix this issue too along with those other two...) : Turns out it's exactly the same as in Leo! ... Meaning that Leo gives me the names like that..! heh...

So I'll leave it like this for now, and by the way, buttons created this way are 'cleaned up' of directives, so this only applies to '@commands'.

Maybe I'll get @edreamleo 's input later to see if it should be changed in Leo, if anywhere.