Core package should be bundled into Angular dist

[JakeLo123]

Core package should be bundled into Angular dist

This is to handle #84. See "Solution" heading--it describes what has been implemented on this branch.

Changes

• Add extra details to README including ones relevant to this architecture decision.
• Add git-ignored src/sdkcore folder inside angular library.
• Add getSDKCore.js and script to execute it within the angular build.
• Add angular yalc-pub script
• Remove use of absolute paths from core package.

Pre-Merge Checklist (if applicable)

• Unit and Feature tests have been added/updated for logic changes, or there is a justifiable reason for not doing so.