Update ReSharper settings
Attempt to fix rare race/fail in async stress test
Remove old unit-test projects
Add new platform-specific test projects, uses file linking to shared test files :/
Modify tests to use platform-specific ISQLitePlatform implementations, uses #ifdef :/

Win32 test project now compiles and all tests complete successfully.
WinRT and WindowsPhone8 test projects still fail to compile (due to use of unsupported API's).
Android test project is untested.
IOS test project runs and many tests are successfully, but several fail and some crash/hang (async).