Feature/optional params on components

[aswallace]

Context

Minor UX housekeeping: These component properties should be made optional to conform to UX recommendations:

1. Tooltips are only useful if they add info--should not be present if they would exactly match the button text
2. Most of our modals should not be movable/should not show the drag cursor

closes #348 and #349

Changes

• Made title (the tooltip) an optional property for Base, Primary and Secondary buttons. Still required on Tertiary since those are icon-only
• Made modals non-draggable by default by adding an optional isDraggable property

Testing

• Updated unit tests since the button dataset-id was previously constructed from title

To do

• Check with UX on which (if any) modals should still be draggable
• I made some of the tooltips more descriptive instead of removing them, but am open to suggestions