New Features

runhcs
- Adds support for OCI mount.Type "physical-disk" and "virtual-disk" for WCOW and LCOW.
```
m := &oci.Mount{
    Type: "physical-disk",
    Source: "\\\\.\\PHYSICALDRIVE1",
    Destination: "C:\\test" // LCOW '/mnt/test'
```
```
m := &oci.Mount{
    Type: "virtual-disk",
    Source: "C:\\test.vhdx", // OR 'C:\\test.vhd'
    Destination: "C:\\test" // LCOW '/mnt/test'
```
- Stop loading ole32 to improve process activation
- Set TerminateOnLastHandleClosed for all UVM activation's to guarantee resource cleanup on runhcs.exe exit.
- Set StopOnReset for all UVM activation's so that the guest VM does not try to restart on reset.
- Change default LCOW activation's to use rootfs.vhd when present over initrd.img by default.
- On builds >= 18286 add support to LCOW for booting directly from the kernel (compressed or uncompressed)
- Adds LCOW HNS network namespace support.
- Adds support for logging all logrus messages to ETW for all runhcs.exe invocations.
- Various performance and logging improvements for diagnostics.
uvmboot
- Introduces the uvmboot.exe tool for creating/starting/measuring performance of various LCOW configurations. This does not activate any containers but can be useful for creating/testing different LCOW options with various HCS/kernel features.

Bug Fixes

runhcs
- Properly set all Plan9 shares ReadOnly when OCI opts ro is set.
- Properly convert from Docker TERM, KILL, 15, 9 signals for Windows container Kill requests using Unix semantics.