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/readeractivityindicator.lua

@@ -0,0 +1,47 @@
+local EventListener = require("ui/widget/eventlistener")
+local Device = require("ui/device")
+-- lipc
+
+local ReaderActivityIndicator = EventListener:new{}
+
+function ReaderActivityIndicator:init()
+    local dev_mod = Device:getModel()
+    if dev_mod == "KindlePaperWhite" or dev_mod == "KindlePaperWhite2" or dev_mod == "KindleTouch" then
+        require "liblipclua"
+        self.lipc_handle = lipc.init("com.github.koreader.activityindicator")
+    end
+end
+
+function ReaderActivityIndicator:onStartActivityIndicator()    
+    if self.lipc_handle then
+        -- check if activity indicator is needed
+        if self.document.configurable.text_wrap == 1 then
+            -- start indicator depends on pillow being enabled
+            self.lipc_handle:set_string_property(
+                "com.lab126.pillow", "activityIndicator",
+                '{"activityIndicator":{ \
+                    "action":"start","timeout":10000, \
+                    "clientId":"com.github.koreader.activityindicator", \
+                    "priority":true}}')
+            self.indicator_started = true
+        end
+    end
+    return true
+end
+
+function ReaderActivityIndicator:onStopActivityIndicator()
+    if self.lipc_handle and self.indicator_started then
+        -- stop indicator depends on pillow being enabled
+        self.lipc_handle:set_string_property(
+            "com.lab126.pillow", "activityIndicator",
+            '{"activityIndicator":{ \
+                "action":"stop","timeout":10000, \
+                "clientId":"com.github.koreader.activityindicator", \
+                "priority":true}}')
+        self.indicator_started = false
+        util.usleep(1000000)
+    end
+    return true
+end
+
+return ReaderActivityIndicator