Feature: Offset Pasting

[dreamsyntax]

Scenario:
You define a struct in memory that has 0x2C entries. This struct is re-used a bunch of times for different objects, all 0x2C apart.

If I select a group of nodes and copy them, I want an additional paste that will add my offset to all base addresses.
This would allow for rapid defining of common values structs in a dmw file.

For the initial version, just adding base address support is good enough.
Adding offsets to pointers may get complicated and/or should be its own feature.