Sync fork into official version

[dmitry-zaets]

This PR introduces:

• Fix On Standalone script closeBehavior: accept does not work  #104
• A possibility to add default buttons to accept/deny cookies via bannerActionsBlock
• A possibility to add custom buttons block via bannerActionsBlock
• Hide Clone button via bannerHideCloseButton
• Fix the dialog on iPhone
• Add option to show banner as modal
• Use only loadsh-es and remove lodash package and include only used functions instead of the whole package (reduce the final bundle size)
• Update webpack CLI

Screenshots:

A possibility to add default buttons to accept/deny cookies via bannerActionsBlock

Default Buttons	Without Close Button

A possibility to add custom buttons block via bannerActionsBlock

Custom Buttons	Without Close Button

Mobile:

Default Buttons	Without Close Button	Custom Buttons	Without Close Button

Fix the dialog on iPhone

Before	After

Banner as Modal

[pooyaj]

@dmitry-zaets amazing work 🙌

[camwest]

@dmitry-zaets what's the ETA on cutting this release? Very excited!

[felipe-najson-ntf]

Hi @camwest! We will be working this week to publish the new version of the library.

Segment team.

[pooyaj]

@camwest @felipe-najson-ntf 5.3.0 is now available on npm 🎉