Upgrade to solarized-dark-syntax to update to standard colors
Add TextEditor::getDecorations and ::getOverlayDecorations

Required for autocomplete upgrades.

Signed-off-by: Max Brunsfeld <maxbrunsfeld@gmail.com>
Add ‘position’ option to overlay decorations

By default overlays are positioned at the head of the given marker.
This option allows them to be positioned at the tail instead by passing
`position: ’tail’` when creating the decoration, which is useful for 
autocomplete.