Merge pull request #47 from unfear-underscore/master

Update PaginationManager.java

refact: make uncancellable preclosevent.

refact: update line seperators

update XMaterial.java

update version.

Merge remote-tracking branch 'origin/master'

fix: dysfunctional icons are not able to put at 0. slot.

fix: pagination manager gui cleaning problem has fixed

feat: minor document and null safe improvements

chore: clean code.