feat(@angular_devkit/core): add titlecase string util

[JaimeStill]

add titlecase string util

[alan-agius4]

Hi @JaimeStill,

Thanks for your contribution.

However since this utils is not needed directly by the tooling packages. If you need this in your project it's suggested that you add it there.

[angular-automatic-lock-bot]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}