This fixes an issue where trees are omitted from Mapgen V6 maps on
configurations that explicitly defined the mgv6_spflags setting.

Edited packages to reflect correct packages

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Doing it the other way round was a mistake, since it breaks
minetest.formspec_escape with escape sequences that contain
special characters.

This makes it work even if it contains escape sequences,
which didn't work before.

Fixes the issue introduced by c1a0ebb7 (Fix use of uninitialised variable
in class Event) causing Windows builds to fail

The path finding code works fairly well except that it considers
anythin not CONTENT_AIR to be "above the surface". This results in
paths that are unwalkable for entities since e.g. plants are not
walkable. The path would force them to jump on top of grass plants,
etc..

The obvious solution is not to use CONTENT_AIR as a criteria, but
instead distinguish between walkable and non-walkable nodes. This
results in paths that properly walk through grass nodes.

This was extensively tested by a flock of electric sheep.

Note that for underwater purposes this changes the behaviour from
"the surface is walkable" to "ignore water entirely" making the
path go across the water bottom, and pathing fail likely from the
water surface. This is intentional.

Before, the GridNodes were stored in vector<vector<vector<T>>>,
and initialized in advance. Putting three vectors inside each other
puts lots of unneccessary stress onto the allocator, costs more memory,
and has worse cache locality than a flat vector<T>.

For larger search distances, an the array getting initialized means
essentially O(distance^3) complexity in both time and memory,
which makes the current path search a joke. In order to really
profit from the dijkstra/A* algorithms, other data structures
need to be used for larger distances.

For shorter distances, a map based GridNode storage may be slow as
it requires lots of levels of indirection, which is bad for things like
cache locality, and an array based storage may be faster.

This commit does:

1. remove the vector<vector<vector<T>>> based GridNodes storage that
	is allocated and initialized in advance and for the whole
	possible area.

2. Add a vector<T> based GridNodes storage that is allocated and
	initialized in advance for the whole possible area.

3. Add a map<P,T> based GridNodes storage whose elements are
	allocated and initialized, when the path search code
	demands it.

4. Add code to decide between approach 2 and 3,
	based on the length of the path.

5. Remove the unused "surfaces" member of the PathGridnode class.
	Setting this isn't as easy anymore for the
	map based GridNodes storage.

There is no need to reinvent the wheel here, we have
great classes from irrlicht.