Important: fixed resourcepacks apply problem on some servers

from previous update:

Important: FIXED precompressed resourcepack for new customers. Please delete the config.yml if you get wrong textures on screen and restart.

changes:
- removed /iadownload command, use the /iapack or /iatexture command.
- changed /iatexture command behaviour. Now it won't redownlaod the pack everytime but will allow the client to check if they already downloaded it and apply the cached pack instead

new:
- new command /iasha1, useful only to the developer
- added new option "notify-other-plugins-interfering" in config.yml to notify if another plugin is interfering with itemsadder resourcepack

api:
- now getCustomBlockItem() methods of the events won't return the global itemstack but a copy of it to avoid bad things
- added new method ItemsAdder.applyResourcepack(player)
- added new event ResourcePackSendEvent

fixes:
- fixed clientside desync when breaking REAL_NOTE blocks in CREATIVE mode
- optimized font images replacement in chat
- fixed ia.admin.iatotemanimation and ia.admin.iaplaysound permissions not working
- fixed search GUI error in console https://github.com/PluginBugs/Issues-ItemsAdder/issues/855
- now other plugins won't be able to apply resourcepacks if "apply-on-join" is true in config.yml of ItemsAdder
- better black screen on loading resourcepack
- better resourcepack apply logic