allow changes of scripts by type

[David Nalesnik]

Hi,

It is a common request to be able to change the defaults of specific
scripts globally.  An example would be changing the padding and font-size
of "tenuto" throughout a file.  Currently, the user needs to tweak each
instance of the right Script, a process that is tedious and error-prone.

There is a snippet which makes such changes much more convenient:
http://lilypond.org/doc/v2.19/Documentation/snippets/tweaks-and-overrides#tweaks-and-overrides-overriding-articulations-of-destinct-type

This capability ought to be part of the codebase, either through the method
in the snippet, or through the addition of a context property--something
like "scriptExceptions" to work in conjunction with "scriptDefinitions".

I would like to open a discussion of the best approach to the problem,
through tweaks (as in the snippet), or through context properties (for
which I can provide a basic patch.)

Could the bug squad open an issue for this?

Thanks!
David