Allow default title to have initial caps

[mdhender]

Would like to specify the name of new content in all lower case and have the default title created in the front matter converted to initial caps.

$ hugo new post/init-caps.md

Current output:

+++
date = "2016-11-27T18:58:19-06:00"
title = "init caps"

+++

Would like to see

+++
date = "2016-11-27T18:58:42-06:00"
title = "Init Caps"

+++

[bep]

Note that title casing is a style not used in all languages, also title casing isn't probably what you really want in this case, see #989.

So, to get this right would be a challenging task.

But it should have the first character upper.

[mdhender]

If no one objects, I'll name the config option "coerceTitleFormat" with this fix looking for "initCaps". That way I can avoid title case completely.

[bep]

This will be handled in round-about way in #2746

[github-actions]

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