Fix: Wrong variable used to check for metrics files on BLF

Looks like this is has been there since the initial commit
of BLF.

The blf_dir_metrics_search was using the pointer to the
extension of the file and not the full path to check for
metrics files (.afm/.pfm).

Never notice before probably because is not common to use a font
with additional metrics files.

Move glTexEnvi to draw__start/draw__end.

As Campbell point, this is to avoid call glGet/glTexEnvi
on each character.

Fix:
[#25834] no color of textobjects in game engine when combined with
textured objects
[#26893] Curruption of displayed text (debug properties/fps info or bgui)
when using animated/tile uv mode

The first bug was beacuse a bad mode on the texture environment, now
we save the current glTexEnvi, set the one that we need, draw and
restore the original at the end.

The second was because a missing call to glLoadIdentity for the
texture matrix and as we do before, now we do a gl-Push/Identity/Pop
for this matrix to.

The first problem was solved by Kanttori and the second by Dalai.

Rename global_ft_lib and make it static.

Remove the XXX code from blf_glyph.c and use the pointer
inside the FontBLF struct.

If still have problem, let me know.

Ghost:X11 Set the default max width and max height value.

Some window manager can set default value of this to be the
screen size, so running blender with -p or --window-geometry
don't work with value bigger than that.

This commit try to "avoid" the bug #25709, but at the end
depend on the window manager, so maybe work or maybe not.

Change the BLF_aspect function to handle 3d text.

This is need to properly handle 3d text (dalai work on GE), before
the BLF_aspect only take one argument, and the result was a call to:
glScalef(aspect, aspect, 1.0)

Now the three value are store in the font (x, y and z) and also
need to be enable using BLF_enable(BLF_ASPECT).

By default all the code that don't have BLF_ASPECT enable work with
a scale of 1.0 (so nothing change to the current UI).

I also remove all the call of BLF_aspect(fontid, 1.0) found in
the editors, because is disable by default, so no need any more.

Campbell the only thing to check is the python api, right now
I modify the api to from:
BLF_aspect(fontid, aspect)
to:
BLF_aspect(fontid, aspect, aspect, 1.0)

This is to avoid break the api, but now you need add the BLF_ASPECT
option to the function py_blf_enable and in some point change
py_blf_aspect to take 3 arguments.

Add the possibility to set a 4x4 matrix to be used on blf.

This option allow the user to set a 4x4 matrix to be
multiplied before draw the text, for example:

double *m;

/* Get the matrix or build it! */

BLF_matrix(m);
BLF_enable(BLF_MATRIX);

/* set color, size, etc and draw! */

BLF_disable(BLF_MATRIX);

You don't need the last line (disable), but remember
that if you use the font to draw in any other place,
the matrix will be used!.

The GL code is:

glPushMatrix();
glMultMatrixd(m);
glTranslatef();
glScalef();
glRotatef();

glPopMatrix();

Let's Dalai test this!!! :D

Testing commit! Remove an empty file.

Fix #22894

[#22894] SEQUENCER; Drag & Drop into VSE as strip sends user to
file manager for import - MS Windows

The invoke function for both operator don't check the the filepath
property (this come from the drop event), so always open the
file browser.

Note that this problem is still there for Image, but there is something
else there, because the op SEQUENCER_OT_image_strip_add never got
this property (filepath). I check and the problem seems to be the
missing WM_FILESEL_FILEPATH when call WM_operator_properties_filesel.

The problem is that if I put this flag in the function, the image
strip stop working, so have to check a little more about this.
(Any idea why ?)

Fix #22905

[#22905] Adding objects with a grid size of <1m results in a 0 size object

The problem here is that the return value of the function
ED_object_new_primitive_matrix is a float, not an int.

This come from an old revision, before the two dia and depth
multiplication was using the function (two call to the same
function). This was change to only call the functio one time
and store the value in the "scale" variable, but the scale
was declare as int, not float.