CLI package to support playable-ads package builds

CLI commands

- playable-ads new [project-name] - Boilerplate to create a new Playable-ads project
- playable-ads assets - convert assets to base64 objects and store in one js file
- playable-ads mergeJs2Index - merge javascript files info index.html file
- playable-ads fbPackage - create facebook playable ads package
- playable-ads storeUrlsToIndex - write store urls to index.html from def json
- playable-ads - help

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Boilerplate

playable-ads new [project-name]

The purpose of this boilerplate is to create a project with build support for most popular ads platforms.

The boilerplate contains build scripts for each ads platform.

Builds for supported platforms:
- npm run build-fb - Playable ads for Facebook
- npm run build-tiktok - Playable ads for TikTok
- npm run build-google - Playable ads for Google
- npm run build-unity - Playable ads for Unity
- npm run build-ironsource - Playable ads for Ironsource
- npm run build-applovin - Playable ads for AppLovin
- npm run build-moloko - Playable ads for Moloko
- npm run build-mintegral - Playable ads for Mintegral