Merge pull request exch-bms2#500 from Shimi9999/fix-searchtextfield

Fix searchtextfield

MainState : add null checker to setSkin()

Merge pull request exch-bms2#472 from Shimi9999/improve_randomselect

Improve randomselect

Merge pull request exch-bms2#461 from NS-Kazuki/image

enable imagefile priority

fix exch-bms2#441

Merge branch 'master' of https://github.com/exch-bms2/beatoraja.git

Merge branch 'master' of https://github.com/exch-bms2/beatoraja.git

ResourcePool : modify some methods to thread-safe (need to test)

PlayerConfig : add 10key PlayModeConfig

update version value