Previously, pathMakeRelative didn't make a distinction between relative
and absolute paths. The input would always be converted to a relative
path, then checked against a number of places (e.g. the current
working directory, all the locations in the search path...).

This causes an issue for functions such as getNthFileNameInFolder. Quite
often, this is used for absolute paths constructed with "the pathName"
as a base. ScummVM assumes the game root is also the root of the volume
(e.g. "C:\"). As such, when you would call getNthFileNameInFolder("C:\",
1), this would be translated to a relative path of "", and then match
with the current directory provided from getCurrentPath; clearly not the
same thing.

To fix this, we detect if the input to pathMakeRelative is an absolute path,
and if so avoid checking every location in the search path and prefixing
the result with getCurrentPath().

Fixes "I am unable to save or retrieve games" error message in The Dark Eye.

SpaceMgr::m_parseText can be called multiple times, and assume the context
from the previous call exists. For example, ml.dir in The Dark Eye will
call it twice; the first time with a full hierarchy starting with a
SPACECOLLECTION, the second time with a hierarchy starting with a SPACE
and assuming _curSpaceCollection was set by the previous call.

We should be able to reuse the object's global "_cur" values for this,
as the game will override them soon after loading the model with a
SpaceMgr::m_setCurData call.

Fixes loading the scene graph data in The Dark Eye.

Fixes visiting Mount Olympus in Wrath of the Gods.

b_go() should only reset the custom event handlers when switching
movies, not just frames.

Fixes firing the bow at the dragon in Wrath of the Gods.

Fixes palette glitches when rotating the probe in the Mac version
of Majestic: Part 1.

The CLUT in the resource fork can contain palettes unused by Director;
the key is that all of the ones used for cast members have a palette ID
of the cast ID + 1024. This is effectively what the D2 branch was
relying on, so we can clean up the logic and use it for D3 as well.

Fixes the Invictus logo in Over-Ring-Under, the colour cycling in The 7
Colors, and countless others.

Fixes the colors in Gahan Wilson's The Ultimate Haunted House.