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'

game.project

@@ -5,8 +5,8 @@ main_collection = /example/example.collectionc
 shared_state = 1
 
 [display]
-width = 400
-height = 400
+width = 600
+height = 900
 
 [project]
 title = druid
@@ -14,3 +14,6 @@ title = druid
 [library]
 include_dirs = druid
 
+[graphics]
+texture_profiles = /example/res/custom.texture_profiles
+