Updated docs

There is still stuff to do

docs/objects/Progressbar/setProgress.md

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+## setProgress
+This is the function you need to call if you want the progression to change.
+
+#### Parameters: 
+1. `number` a number from 0 to 100
+
+#### Returns:
+1. `object` The object in use
+
+#### Usage:
+* Creates a progressbar and sets the current progress to 50
+```lua
+local mainFrame = basalt.createFrame()
+local aProgressbar = mainFrame:addProgressbar()
+aProgressbar:setProgress(50)
+```