Tabbed sound and costume panels

Sound library first iteration

Remove target pane button and actions

Add back putting the sound library in the ui

Fix block editor borders 

Fixes #156 + refactored classnames to style guide conventions

Affects SpriteSelector Pane, StageSelector Pane, Stage, MenuBar, Libraries Modal, Add/Import buttons, for Chrome, Ffx + Safari on Sierra.

Fixes #162

Add simple blocks background pattern

* Update blocks.js

Store the scroll/zoom of the workspace on a per-target basis

Fixes #220

* chore(package): update react-redux to version 5.0.3

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* chore(package): update style-loader to version 0.13.2

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* chore(package): update react-modal to version 1.7.2

Closes #151

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* chore(package): update postcss-loader to version 1.3.3

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* chore(package): update babel-loader to version 6.4.0

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* chore(package): update css-loader to version 0.26.4

Closes #133

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* Trust babel for the future

Sprite delete button

* Buffer sprite info text fields

Changes to the name, x, or y fields should only be sent to the VM when the field is blurred or when enter is pressed.

Still allow updates while the fields are focused, but unchanged.

Fixes #154

* Remove focus from input fields after hitting enter

* Fix prop types for info component and container

Refactored towards better convention for linting.

Add sounds to each letter sprite in the library

SpriteInfo: Design + refactor pass
* Updated SVG icons
* Added tab indexes, related #88. Still no tab on radio buttons
* Removed outline on dropdown focus
* Radio icons: fixed redirecting issue, using `div` instead of `a`. Temporary, until radio buttons. Related #156
* All icons: unselectable to prevent highlighting. Radio icons clickable
* SpriteSelector: fixed bottom padding in scroll wrapper

* Design pass on libraries to make sprites look more like they do in the SpriteSelector. Fixed scrolling overflow when reaching the bottom
* Started a colors variables file
* Added a light transform on sprite item hover

Related #12

* WIP: drag states in stage component

* WIP: Hacky drag canvas

* Update sprite position on drag

Use VM to put sprite into drag state and update the sprite's position while dragging.

Temporarily don't use the drawable data to drag a new canvas, this can happen whne we have somewhere to drag the sprite to.

Wire sprite info panel to VM

These aren't necessary to update in realtime, so throttle them to once every 30ms