Made GuiDropdown only accept instances of GuiEntryListEntry to avoid unneccessary toString() methods returning the name
Added GuiEntryListValueEntry which holds a Value and a Name to be displayed
Continued work on GuiObjectManager
Added HSV noise to GuiTimeline's textures to somewhat hide the repeating body texture
Implemented GuiTimeline in GuiObjectManager's GuiObjectKeyframeTimeline
Added asInt() method to TimestampValue, to avoid int casts of value field