Feature/scroll (#22)

* base scroll implementation

* add scroll collection example
mofidy scrolls, fix callback calls

* unhover button if start swipe
notify input components on swipe

* add node center offset, calc by pivots
modify with with node center scroll (to correct scroll to point)

* Refactor, add some docs

* fix: set_pos on end on scroll

* add gui.animate speed in settings

druid/settings.lua

@@ -21,6 +21,16 @@ M.progress_rich = {
 	DELAY = 1, -- delay in seconds before main fill
 }
 
+M.scroll = {
+	FRICT_HOLD = 0.8, -- mult. for inert, while touching
+	FRICT = 0.93, -- mult for free inert
+	INERT_THRESHOLD = 2, -- speed to stop inertion
+	INERT_SPEED = 25, -- koef. of inert speed
+	DEADZONE = 6, -- in px
+	SOFT_ZONE_SIZE = 160, -- size of outside zone (back move)
+	BACK_SPEED = 0.2, -- lerp speed
+	ANIM_SPEED = 0.3, -- gui.animation speed to point
+}
 
 function M.get_text(name)
   -- override to get text for localized text