3.0-fixed

• the code has been optimised
• comments were added for most classes
• added builder for GuiItem (item#builder().build())
• added method to update Gui name (getGui()#updateTitle(name))
• added method to update GuiItem (getGui()#updateItem(item))
• added method to remove a GuiItem (getGui()#removeItem(item)))
• changed click listener for GuiItem, now .getCurrentItem() returns GuiItem, not ItemStack
• fix so that actions work when setting ItemStack by @justADeni in #3

Full Changelog: 2.1...3.0

2.1

• added potion, banner support
• we can edit itemstack in builder
• builder has meta method, you can change itemmeta, if builder doesn't have methods
• added getters for paginatedgui (currentpage, pages)

2.0

• Added a system of static and dynamic items
• Gui's inventory filling system has been rewritten
• Now you don't have to open the inventory manually after initialization (automatized)

v1.3

added gradient system (@justADeni)

v1.2

Small changes:

• added paper dependent
• added eng documentation
• enchantment fix

thanks, @justADeni

v1.1

Добавлена поддержка голов, исправлены все баги с v1.0