Fixes and additions for PaginationPanel

• Fixed issue where PaginationPanel would never display the final element that was added
• Fixed issue where PaginationPanel#getMaxPage would divide by zero when no slots were added
• Added PaginationPanel#clear to remove all added elements
• Added methods to get all added ItemStacks and ItemButtons

Base commands are no longer tab-completable without permission

• Users used to be able to tab-complete the names of base commands they didn't have permission for, this is no longer possible
• Added PaginationPanel#setPage, since you may sometimes need to skip to a specific page rather than moving one page at a time

InventoryGUI pagination and ConfigCollection

• InventoryGUI can now be paginated using the PaginationPanel utility class
• ConfigManager#collection can now be used to wrap any collection type for saving and loading to config

Remove minecraft namespace prefixes from serialized MultiBlockStructures

• minecraft: will no longer be included in front of block names (1.13+)

Fix issue causing structure scanning to not work in some cases

• Rewrote structure scanning method entirely
• Issue happened in 1.12, still not sure what cause was
• Structure scanning is now faster and less memory-intensive

Fix bug related to kotlin plugins

• Skip classes which throw NoClassDefFoundError when finding subclasses at runtime

Fix bug with WeightedRandom

• WeightedRandom will no longer have biased RNG after removing an outcome (thanks for the PR, divios)

Fix bug with RedCommands, ItemUtils now mutates

• Fix bug with command manager where messages would display as their name rather than their value
• Commands now implement PluginIdentifiableCommand, which should make them more reload-friendly
• ItemUtils now mutates items rather than returning clones
• ItemBuilder now no longer returns a new ItemBuilder object with each call, instead mutating and returning itself

Add support for hex codes

• FormatUtils moved from RedLib to RedCommands
• FormatUtils#color now supports hex codes by default in the format &#FFFFFF
• You can now set custom formatter functions for Messages
• Messages now support hex codes by default in the same format as FormatUtils#color

Fix rare NPE with ConfigManager

• NPE would happen when trying to load a mapped object from config where no configuration section existed for the object
• This would only occur if the object was stored directly in a field rather than in a map or list, and saveDefaults was not called