added currentPageCallBack for the process of the current page

[KMJ-007]

in large pdf, want to show the progress of the currently processed pages, so user can also know where the process has reached, and don't close the window

let me know what i can do better, i just had this in my mind, so implemented it

[changeset-bot[bot]]

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Latest commit: 14b24cadea7f429487fd2ab691c9f55556ed915c

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[KMJ-007]

@diegomura can you look into this ?

[ASutrick]

Would love to see this implemented