Make the sample work on UWP and add UWP projects and compiled DLLs (case 1093464).

Approved-by: Jan Marguc <janm@unity3d.com>

…ns whitespace

Add .gitignore from .hgignore and also ignore unity generated files

VS: Fix post-build errors

Fix linux makefile build

* - Fix class name conflicts between dll and player (e.g. class Mutex)
- Fix new / delete mismatching(effectdata is correct in some case)
- Fix compiler warning about numeric casting
- Support PlatformMutex

* - Fix compiler warnings about casting
- Revert including assert.h just in case

* Add AudioPluginUtil namespace for all referenced classes, functions and constants.

Add fixed value defines for Android & any other platforms in AudioPluginInterface.h.

Revert changes for PLATFORM_MUTEX

…o-10-14

Update the Xcode project and compiled output to work on Apple silicon and macOS 10.14

UNITY_AUDIODSP_EXPORT_API sets default visibility

…ags_UseOutputChannelCount. (#19)

The new header version 0x010403 ships with Unity 6.7 and allows ambisonic audio plugins to get an `outchannel` different from `inchannels `in their process callbacks. This allows plugins to use the whole channel layout as output. 

This is particularly helpful when the project uses a layout that has more channels than 1st order clips (so more than 4).