* feature: Extend VideoWriter to accept vector of parameters
- Add additional constructor and `open` method for `VideoWriter`
those accept a vector of parameters
- Move actual implementation of the `VideoWriter::open` to general method
which accepts vector of parameters
- Propagate parsed parameters map up to actual video backend construction
* fix: Change VideoWriter constructor description to suppress doc warning
* refactor: Rollback newlines changes
* feature: Changed VideoWriter parameters workflow
* feature: Log unused parameters in VideoWriter open
* doc: Fix VideoWriter `isColor` parameter description
* fix: int to bool VC++ conversion warning
* doc: Remove information about `isColor` flag usage.
Fix errors in file cap_avfoundation.mm.
Compiled with Xcode 6.2, iOS SDK 8.2
Example:
cap_avfoundation.mm:543:54: error: cannot initialize a parameter of
type 'AVCaptureFocusMode' with an rvalue of type 'int'
if ([mCaptureDevice isFocusModeSupported:(int)value]){
^~~~~~~~~~
