- cmake dependencies search (WITH_MFX option)
- raw H264, H265, MPEG2 encoding and decoding
- tests for supported formats

Usage:
    writer.set(cv::CAP_PROP_IMAGES_BASE + cv::IMWRITE_JPEG_QUALITY, 80);

* Changes delegate property from assign to weak

In modern Objective-C delegate should be weak. In very rare conditions you might want delegate be strong.
Assign for delegate is sign of legacy code.
This change prevents crash when you forget nil delegate in dealloc and makes rush with nilling delegate unnecessary.
This change shouldn't break any existing code.

* Adds implementation for setters and getters for weak delegate properties for non ARC Obj-C files

For whatever reason compiler can't synthesize these.
And yes, it's time to convert all Objective-C stuff to ARC.

strong and retain are synonymous but using strong along with  obsolete synonym retain in one file is negligent

- added CAP_PROP_XI_SENSOR_BOARD_TEMP parameter
- added acquisition resetting for paramters that require it

- fixed getProperty call definition
- added new parameter defitions

removed whitespaces

Reworked enumerators to keep values from previous commit

ximea enums fixes

- fixed whitespaces issue
- fixed duplicate enum values error

ximea enum definitions update

- fixed videioio.hpp code style
- fixed ABI violation in enums
- added new parameter handlers to cpp

XIMEA setProperty update

Added acquisition resetting to buffer size adjustment parameters.

Removed tabulators from enumerators and ximea adapter source as reported
by precommit docs test.

- replaced m3api/m3apiX64 binaries with latest xiapi32/xiapi64 to
support latest camera models
- added new parameter definitions to videoio_c.h and
SetProperty/GetProperty calls
- added acquisition resetting for specific parmateters in SetProperty
call
- added new error return value evaluators

also refactor property range handling and opencv property to V4L2
translation.

a separate function instead of an overload not to change the ABI.

rename VideoCapture paramter 'device' to 'index' in CPP to reflect that
it allows specifying the API.
update comments to explain how to specify the API.

Fixed errors in parallel_for based on pthreads

Fixing compiler errore & removing whitespaces

Fixing prallel_for_pthreads error and warnings on win

- fix compilation for old libraries
- update codec/tag selection logic
- add documentation note about MP4 container tags