New advanced option: Pause before building PKG

[JeymyAV]

Hi, It is very important to have a new advances/expert option to pause the process before building the final PKG so we can change or replace any file.

This is necessary because for some games that you want to rip some languages, but to get it working well you need to update some xml file where there are the reference descriptors to the languages files that you have truncated/removed if not the game will crash. The new option can be some similar to this example from other similar program:

By default the new option should be no market and then all the process will run as now. If the user mark/select the new option before start, then all the process run as now, but before the last step (to build the final PKG, the process is paused with a window message and the folder with the temporal files are showed in the windows explorer so the user can replace/update whatever file... After that the user click in the windows message so it is closed and the process continue building the final PKG.

[PhR34x0r]

This would be awesome as it would also allow tinkering with die .gp4 and .sfo files to manually fix the "invalid <volume_ts>" error on some PKGs before the build starts