added two menu buttons for exporting and importing PNG stitches of the opened texture pack, integrated them with the application, prepared the export stitch dialog, added the capability of having a FileInput which selects folders
completed the first rudimentary export of stitched PNGs for items and blocks, now a way to import just new ones must be found (maybe directly comparing against vanilla?). In addition textures which are have multiple sprites (eg animated water) must be handled in a special way
Added the import stitch dialog, coded the hashcode calculation for sprites and prototyped the import routine (which should check which sprites have been changed and import just them
import procedure that unstitch data implemented, it works by calculating MD5 of the sprite to understand if a sprite has been modified to replace it in the existing pack
rewrote the export engine to use a texture packer tree algorithm to be able to pack different sized texture (eg. entities), added options to enforce block size for missing blocks, tested the procedures and enriched the available export categories
refactored packages
Merge pull request #15 from Jakz/master

PNG stitcher and unstitcher for groups of textures