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spu_sys_t::i_channel is not equal to the number of currently used
channels but t is equal to the number of reserved channel since the spu
creation.

This removes a dangerous vlc_object_find(PARENT) and potentially
invalids var_DelCallback().
It also avoids useless callback destructions and so fixes some dvd menus.

As a side effects, it may improve a bit frame stepping.

Attach the vout object to parent before spu creation so modules loaded by spu can use var inheritance.

It was duplicated with es_format_t::i_sar_num/den.

Keeps previous behavior when subtitles overlapped in time,
except when trying to move subtitles below the bottom picture edge
-> they start to visually overlap because of bounding.

This reverts commit 4c627dc6.

Fixes the glitch when displaying subtitles and subtitle position != 0.
Modifies behavior when subtitles overlap: newer subtitles push older ones higher

They were introduced by [9b8c543c].
For example: the PiP for a snapshot was not shown when the stream
was paused.

It fixes at least RGB  blending with opengl on little indian arch.

 Without this patch, all epehemere subpicture with the same start
date are blended over the picture.

It avoids loosing subtitles with the messages
"main subpicture error: subpicture heap full".

Dynamic subtitles are used by ssa and kate.
This commit breaks the API for 2 functions used by the transcode module.

find a correct blending module given input and output chromas. Instead
of displaying the input chroma and the output chroma in the error
message, it displays two times the output chroma.

This patch corrects the typo.
Signed-off-by: JP Dinger <jpd@videolan.org>

 There will be some regressions, I used automatic sed replacement with manual
checks but there was a lot to change.
 It's only the first pass.

It had the following functions:
- text_style_New  -- allocates default text style
- text_style_Dup  -- allocates and copies text style
- text_style_Copy -- copies text style
- text_style_Delete -- deallocates text style

NOTE that the vout_ShowText* functions will take a p_style and copy
it internally so you have to free in the caller function.
 Other modules where p_style was malloced there are now fixed to
copy before calling the vout* functions.

Original patch by basOS G with a few modifications by fenrir.
Signed-off-by: Laurent Aimar <fenrir@videolan.org>

It should fix #2622 (segfault with vout-filter).