Reflect all open `v1` PR updates in `v2`

[alexiglesias93]

Includes:

• fix: report values to fixed decimal points and default to input element value on init() #387
• feat: add Intl.NumberFormat to number helpers #388
• fix: ensure regex matches html or text correctly #392
• fix: ensure final value is the end value #395
• adding copy url functionality to socialshare #417

[robertkibet]

All items here will be resolved in this PR: #480