Feature/progress (#17)

* improve example gui. Add simple pages

* return old progress bar with example

* base progress with steps, there is bug with step? 1 ~= 1, small delta?

* polish progress, check float error case

* add callback on end of "to" function, value check

* start of green/red in progress

* add first version of rich progress bar

* make green bar darker

* rich bar fixes

* add delay, before filling in rich progress

* PR fixes

* remove dublicate of 'progress_rich'

druid/base/timer.lua

@@ -1,10 +1,9 @@
 local data = require("druid.data")
 local formats = require("druid.helper.formats")
-local helper = require("druid.helper.helper")
+local helper = require("druid.helper")
 
 local M = {}
 M.interest = {
-	data.LAYOUT_CHANGED,
 	data.ON_UPDATE
 }
 
@@ -36,12 +35,6 @@ function M.set_to(instance, set_to)
 end
 
 
---- Called when layout updated (rotate for example)
-function M.on_layout_updated(instance)
-	M.set_to(instance, instance.last_value)
-end
-
-
 --- Called when update
 -- @param is_on - boolean is timer on
 function M.set_state(instance, is_on)