[Fix] Color Picker now returns rgb string

- Using `toRgbString()` to persist an alpha value if an alpha value was selected other than `1`.
[Fix] Alignment / Column Setting, Table Setting, Font Setting

- Alignment added back to Column Setting component
- Table Setting component now hiding alignment in data font setting
- Font Setting component updated to conditionally include `align` value for default font settings based on `hideAlignment` attribute value
- e2e test updated for Column Setting to include testing alignment
Merge pull request #154 from stulees/bugfix/color-picker-color

[Fix] Color Picker now returns rgb string
Merge pull request #155 from stulees/bugfix/alignment

[Fix] Alignment / Column Setting, Table Setting, Font Setting