move reader code into frontend/apps/reader

it makes more sense to completely separate the UI framework and
application code

also move frontend/ui/configurable.lua to frontend/configurable.lua

frontend/apps/reader/modules/readerrotation.lua

@@ -0,0 +1,78 @@
+local InputContainer = require("ui/widget/container/inputcontainer")
+local Screen = require("ui/screen")
+local Geom = require("ui/geometry")
+local Device = require("ui/device")
+local Event = require("ui/event")
+local GestureRange = require("ui/gesturerange")
+local _ = require("gettext")
+
+local ReaderRotation = InputContainer:new{
+    ROTATE_ANGLE_THRESHOLD = 15,
+    current_rotation = 0
+}
+
+function ReaderRotation:init()
+    if Device:hasKeyboard() then
+        self.key_events = {
+            -- these will all generate the same event, just with different arguments
+            RotateLeft = {
+                {"J"},
+                doc = _("rotate left by 90 degrees"),
+                event = "Rotate", args = -90 },
+            RotateRight = {
+                {"K"},
+                doc = _("rotate right by 90 degrees"),
+                event = "Rotate", args = 90 },
+        }
+    end
+    if Device:isTouchDevice() then
+        self.ges_events = {
+            RotateGes = {
+                GestureRange:new{
+                    ges = "rotate",
+                    range = Geom:new{
+                        x = 0, y = 0,
+                        w = Screen:getWidth(),
+                        h = Screen:getHeight(),
+                    }
+                }
+            },
+            TwoFingerPanRelease = {
+                GestureRange:new{
+                    ges = "two_finger_pan_release",
+                    range = Geom:new{
+                        x = 0, y = 0,
+                        w = Screen:getWidth(),
+                        h = Screen:getHeight(),
+                    }
+                }
+            }
+        }
+    end
+end
+
+-- TODO: reset rotation on new document, maybe on new page?
+
+function ReaderRotation:onRotate(rotate_by)
+    self.current_rotation = (self.current_rotation + rotate_by) % 360
+    self.ui:handleEvent(Event:new("RotationUpdate", self.current_rotation))
+    return true
+end
+
+function ReaderRotation:onRotateGes(arg, ges)
+    self.rotate_angle = ges.angle
+    return true
+end
+
+function ReaderRotation:onTwoFingerPanRelease(arg, ges)
+    if self.rotate_angle and self.rotate_angle > self.ROTATE_ANGLE_THRESHOLD then
+        if Screen:getScreenMode() == "portrait" then
+            self.ui:handleEvent(Event:new("SetScreenMode", "landscape"))
+        else
+            self.ui:handleEvent(Event:new("SetScreenMode", "portrait"))
+        end
+        self.rotate_angle = nil
+    end
+end
+
+return ReaderRotation