Splits App into AppBase & AppWithConfigBase for impl of new webviews

Changes changelog image links to permalinks
Moves all images for docs into a docs folder
Removes unused images

Updates dependencies

Changes from out to dist
Adds size-plugin (commented out for now)
Adds image cache to improve bundle performance

Fixes issue with new typescript
Pins node version to match vscode's version (7.9)

Moves settings images into a settings folder
Adds hover setting images
Updates dependencies

Adds jump to menu to settings
Adds more content to the Welcome page
And more

Adds webpack for bundling (disabled for now)
Uses tslib to bundle less duplicate code

Removes typings (using npm instead)
Fixes some promise catches