[DirectX] add a couple experimental features.

[afedchin]

see title

Description

1. added 10bit output if supported. Allow output 10bit videos without convert them to 8bit. unfortunately HDR is still in progress.
2. added possibility to use separate device for decoding (disabled by default). it allow avoid lockups of device's context

Motivation and Context

How Has This Been Tested?

Tested in run-time with x64 build

Screenshots (if appropriate):

Types of change

• Bug fix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves existing functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the Code guidelines of this project
• My change requires a change to the documentation, either Doxygen or wiki
• I have updated the documentation accordingly
• I have read the CONTRIBUTING document
• I have added tests to cover my change
• All new and existing tests passed