Fixed|Builder|Windows: Checking state of produced packages

The DirState utility class did not know how to handle Windows-style path
separators, causing the produced packages to not be copied to the
BuildMaster.
Fixed|Weapon Info: "Static" psprites (weapon offset scale)

When drawing psprites, the weapon offset scale that is used for
preventing the lowering of the psprite was not applied as intended:
WEAPONTOP cannot be ignored as that is the highest offset that the
psprite will reach (non-zero).

Todo for later: Make WEAPONTOP a DD_value so that it doesn't have to
hardcoded.
Merge branch 'master' into ui-framework