Allow overriding the default delimiter

[mdgreenfield]

For: #1008

This replaces #1081 with a signed CLA.

This implements a defaults section that allows you to overwrite the default delimiters used for all templates.

[mdgreenfield]

@pearkes anything else needed here?

[eikenb]

Hey @mdgreenfield, thanks for the PR.

We'll review it and let you know as soon as we can. It shouldn't be to long.

[eikenb]

Sorry for the silence on this. Other priorities came up but I'm now making a pass reviewing things. Got to this PR first as it came up for discussion internally.

While in general I'm trying to minimize new configuration settings as CT already has a bunch, I'm leaning towards merging this as I think readability is very important. Also making this global makes more sense to me and keeps it simpler than a per-template setting. Anyways, I left a comment with the only change I'd like to see after an initial pass.

Thanks.

[mdgreenfield]

Thanks @eikenb. I've rebased with master and updated the names of the vars and the config used in the config file.