[FEATURE] Added support for DVB inside MKV

[thelastpolaris]

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Added support for extracting DVB subtitles from MKV files. Solves #1000

[ccextractor-bot]

CCExtractor CI platform finished running the test files on linux. Below is a summary of the test results:

Report Name	Tests Passed
Broken	13/13
DVB	5/7
DVR-MS	2/2
General	27/27
Hauppage	3/3
MP4	3/3
NoCC	10/10
Teletext	21/21
WTV	13/13
XDS	34/34
CEA-708	14/14
DVD	3/3
Options	84/86

It seems that not all tests were passed completely. This is an indication that the output of some files is not as expected (but might be according to you).

Your PR breaks these cases:

• ccextractor -tverbose 4e56e88ba4...
• ccextractor -teletext 4e56e88ba4...
• ccextractor -stdout -quiet -nofc -nodvbcolor 79a51f3500...
• ccextractor -stdout -quiet -nofc -nodvbcolor 767b546f96...

Check the result page for more info.

[ccextractor-bot]

CCExtractor CI platform finished running the test files on windows. Below is a summary of the test results:

Report Name	Tests Passed
Broken	12/13
DVB	4/7
DVR-MS	2/2
General	27/27
Hauppage	3/3
MP4	3/3
NoCC	10/10
Teletext	14/21
WTV	13/13
XDS	32/34
CEA-708	14/14
DVD	3/3
Options	79/86

It seems that not all tests were passed completely. This is an indication that the output of some files is not as expected (but might be according to you).

Your PR breaks these cases:

• ccextractor -out=sami -latin1 -autoprogram 5b4e0a6034...
• ccextractor -autoprogram -out=srt -latin1 85271be4d2...
• ccextractor -autoprogram -out=srt -latin1 4e56e88ba4...
• ccextractor -autoprogram -out=ttxt -latin1 c0d2fba8c0...
• ccextractor -autoprogram -out=ttxt -latin1 27d7a43dd6...
• ccextractor -autoprogram -out=ttxt -latin1 efbe129086...
• ccextractor -autoprogram -out=ttxt -latin1 e2e2b501e0...
• ccextractor -autoprogram -out=ttxt -latin1 -datets dcada745de...
• ccextractor -autoprogram -out=srt -latin1 -teletext -tpage 398 3b276ad8bf...
• ccextractor -autoprogram -out=smptett -latin1 -ucla e274a73653...
• ccextractor -autoprogram -out=ttxt -latin1 -ucla -xds b22260d065...
• ccextractor -out=smptett c83f765c66...
• ccextractor -out=spupng c83f765c66...
• ccextractor --capfile /repository/Dictionary/MattS_dictionary.txt c83f765c66...
• ccextractor -in=es dc7169d7c4...
• ccextractor -tpage 801 4e56e88ba4...
• ccextractor -tverbose 4e56e88ba4...
• ccextractor -teletext 4e56e88ba4...
• ccextractor -stdout -quiet -nofc -nodvbcolor 79a51f3500...
• ccextractor -stdout -quiet -nofc -nodvbcolor 767b546f96...

Check the result page for more info.