add refactor docs

doc/refactor.md

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+Beziehung Document <1-1> Buffer <1-n> Buffer State <1-1> Window
+
+Document
+========
+
+In memory representation of a text file
+
+Register
+========
+
+Holds a text fragment
+
+Buffer
+======
+
+Document plus additional meta data.
+
+* document
+* filename
+* undomanager
+* language mode
+* dirty flag
+
+BufferState (ViewState?)
+===========
+
+Holds state specific for a buffer in a window.
+
+* buffer
+* window
+* selection/cursor
+* folding
+* scroll positions
+
+Window
+======
+
+A window is the viewport of a buffer
+
+* one buffer state
+* size on screen in px
+* lineheight
+* wrapping
+* focused
+
+Editor (Model)
+==============
+
+Holds the editor global state
+
+* maanges buffer states
+* list of buffers
+* list of views
+* active window
+* registers
+* search
+* layout of windows (relative sizes)
+* window aspect ratio
+
+LayoutManager
+=============
+
+later
+
+EditorView
+==========
+
+Renders the frame of the editor containing multiple windows and optionally a
+command line.
+
+* keyboard input
+* renders layout of editor views
+* provides parent DOM element for editor views
+
+WindowView
+==========
+
+Renders a single window on the screen.
+
+* mouse input
+* scrolling
+* gutter (line numbers)
+* text rendering
+
+Editor (Controller)
+===================
+
+Ties views and models together. Propagates user and model events.
+
+Might act as a proxy to the editor model. This will be the main entry class for the user.
+
+WindowController
+================
+
+Syncs one WindowView with one Window model
+
+
+Transition/Refactoring
+======================
+
+* rename virutal_renderer to WindowView OK
+* rename edit_session to Buffer OK
+* create Window model OK
+* move state from renderer to window model WIP
+    - remove config.characterWidth OK
+    - remove config.lineHeight OK
+    - remove config from layers. Use this.model instead OK
+    - move scrolling code to the model OK
+    - move updateLayerConfig to model!
+    - create unit tests for window model
+* move event handling code from editor.js to window_controller.js
+* split editor.js into Editor(Controller) and WindowController
+
+* restore scroll position on buffer change
+* editor.$search OK
+
+* addEventListener -> on
+* blockScrolling OK
+* highlightBrackets OK
+* textInput to window_view or pass in as constructor argument
+* remove setSession from text layer
+* text navigation code
+
+* remove default settings OK
+* remove dom.js selection code
+* chrome detection OK
+
+* get rid of "MockRenderer" OK
+* update browser tests
+*