Move external prog actions into gui_actions.cpp because linking order changed

Moved source files to src/, removed zz_ prefix off dialog files.

Viewport no longer offsets stuff based on bbox size, that was stupid. Only use bbox size for initial zoom.

Object editing dialog now can alter the matrix of subfiles and radials

Moved LDraw path setting out of the configuration dialog to the LDraw path dialog, it does the job better.

Added a dialog for inquering the user's LDraw directory, not having it set leads to crashing...

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mercurial