Can't behave well if renderers add their own arbitrary margins
and we have a rows/cols based sub

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

strdup() is as (un)likely to fail as asprintf().

Pointed-out-by: <hugh1234@mail.ustc.edu.cn>

Also use size_t for the size.

In the previous implementation was so unsafe that the ARC
compiler was not able work properly and printed a warning.

While there was no real problem here, switch to blocks to
silence the compiler and see potential errors earlier.

removes temporary text_style_Reset() and finishes
migrating decoders.

We might want to deprecate text_style_New().

use or don't use filter. -1 has no better
meaning than 0 and 0 is for new text-style

Renderer should have final decision of the styles to apply.
Rendered forced styles are applied over text-segments
ones, then renderer defaults (text-style's ones).

Also adds proportional font size.
Fixes all style inheritance and font sizing hacks in region
sys.

Final fixed font size is only computed at update time, if
not set to fixed size by decoder.

because you can't tell if members are
have set value or are unset.

avoids reordering and display delay

caption data rate is 2 bytes per frame at 30 fps

CFBridgingRelease was used in the wrong place.
All view objects should only be retained by the window (and in this
situation by the grid view dicts as well), thus they is no need to
additionally retain them for the p_sys_intf pointer.

Fixes a crash when quitting the interface during media playback.