Fix split resize in release builds by vendoring SplitPane

To support Elm 0.19.1 (and crucially to support optimize mode), this is
vendored version of
[quentin/elm-split-pane](https://github.com/quentin/elm-split-pane)
which builds on a series of forks:

* The original: [doodledood/elm-split-pane](https://github.com/doodledood/elm-split-pane)
* 0.19.0 support: [whale9490/elm-split-pane](https://github.com/whale9490/elm-split-pane)
* 0.19.1 support: [quentin/elm-split-pane](https://github.com/quentin/elm-split-pane)

Author: hojberg

elm.json

@@ -30,8 +30,7 @@
             "rtfeldman/elm-iso8601-date-strings": "1.1.4",
             "ryan-haskell/date-format": "1.0.0",
             "stoeffel/set-extra": "1.2.3",
-            "wernerdegroot/listzipper": "4.0.0",
-            "whale9490/elm-split-pane": "1.0.0"
+            "wernerdegroot/listzipper": "4.0.0"
         },
         "indirect": {
             "elm/bytes": "1.0.8",
@@ -46,4 +45,4 @@
         "direct": {},
         "indirect": {}
     }
-}
+}

src/SplitPane/Bound.elm

@@ -0,0 +1,66 @@
+module SplitPane.Bound exposing (Bound, Bounded, getValue, putValue, updateValue, putBound, createBound, createBounded)
+
+{-| This module defines a value that is between two other values.
+
+@docs Bound, Bounded, getValue, putValue, updateValue, putBound, createBound, createBounded
+
+-}
+
+
+{-| Type that defines a border of values
+-}
+type alias Bound a =
+    ( a, a )
+
+
+{-| Type that defines a value that is within a border of two other values
+-}
+type alias Bounded a =
+    ( a, Bound a )
+
+
+{-| Create a new bounded value.
+-}
+getValue : Bounded comparable -> comparable
+getValue value =
+    Tuple.first value
+
+
+{-| Create a new bounded value.
+-}
+createBounded : comparable -> Bound comparable -> Bounded comparable
+createBounded value bound =
+    putValue ( value, bound ) value
+
+
+{-| Change the value that is bounded.
+-}
+putValue : Bounded comparable -> comparable -> Bounded comparable
+putValue ( _, bound ) value =
+    ( boundTo bound value, bound )
+
+
+{-| Update the value that is bounded.
+-}
+updateValue : (comparable -> comparable) -> Bounded comparable -> Bounded comparable
+updateValue f ( value, bound ) =
+    ( boundTo bound (f value), bound )
+
+
+{-| Change the bound of the bounded value.
+-}
+putBound : Bounded comparable -> Bound comparable -> Bounded comparable
+putBound ( value, _ ) bound =
+    ( value, bound )
+
+
+{-| Create a new bound that can be used to restrict a value.
+-}
+createBound : comparable -> comparable -> Bound comparable
+createBound a b =
+    ( min a b, max a b )
+
+
+boundTo : Bound comparable -> comparable -> comparable
+boundTo ( a, b ) =
+    min b << max a

src/SplitPane/README.md

@@ -0,0 +1,9 @@
+# SplitPane
+
+To support Elm 0.19.1 (and crucially to support optimize mode), this is
+vendored version of [quentin/elm-split-pane](https://github.com/quentin/elm-split-pane) which builds on a series of forks:
+
+
+* The original: [doodledood/elm-split-pane](https://github.com/doodledood/elm-split-pane)
+* 0.19.0 support: [whale9490/elm-split-pane](https://github.com/whale9490/elm-split-pane)
+* 0.19.1 support: [quentin/elm-split-pane](https://github.com/quentin/elm-split-pane)