Add Lo-Dash

[iwehrman]

This pull request addresses #5229 by adding Lo-Dash as a third-party dependency and deprecating a number of internal functions in favor of their corresponding Lo-Dash functions. In particular, this pull performs the following conversions and deprecations:

1. Convert instances of Array.slice(0) to _.clone()
2. Convert the lone instance of NumberUtils.getRandomNumber() to _.random and removes NumberUtils.js
3. Convert StringUtils.htmlEscape to ._escape and deprecates the former
4. Convert CollectionUtils.indexOf to _.findIndex and deprecates the former
5. Convert CollectionUtils.forEach to _.forEach and deprecates the former
6. Convert CollectionUtils.some to _.some and deprecates the former
7. Convert CollectionUtils.hasProperty to _.has and deprecates the former

Functions are deprecated by adding a @deprecated annotation, and by replacing their implementation with the corresponding Lo-Dash function and a console.warn message. All the unit tests look good.

I'll let @gruehle decide if he wants to replace Async.whenIdle with _.debounce. I also didn't replace instances of setTimeout(..., 0) with _.defer because the Lo-Dash implementation isn't worth the trouble. (asap does it better.)

CC @njx

[gruehle]

I'm in favor of replacing Async.withTimeout() with _.debounce().

@peterflynn - thoughts?

[iwehrman]

I've updated the pull request to also completely remove Async.whenIdle in favor of _.debounce. I removed it instead of deprecating it because it's new and there are no extensions in the registry that use it. If this pull is merged, we can also close out #5528, despite the fact that that will break @gruehle's heart.

[iwehrman]

Fixed merge conflicts with master.

[ingorichter]

@iwehrman Looked good! Merged.

[njx]

💵 💵 💵

[lkcampbell]

https://github.com/adobe/brackets/wiki/Brackets-Coding-Conventions#apis-to-use-or-avoid

probably needs an update in light of this change. For example, the part about using CollectionUtils.forEach() or CollectionUtils.some().

[iwehrman]

I made the CollectionUtils -> _ update.