Overview

This PR introduces a few changes:

1. Memory usage now displays "System Used Memory" which will return the "working set" of the process which is similar to what Task Manager displays in Windows. But this is not available on all platforms (like WebGL) so instead return Profiler.GetTotalReservedMemoryLong() which is the total memory Unity has reserved for current and future allocations.

2. A New property called "TransformToFollow" has been added to allow users to select a transform to follow rather than the main camera. The sample scene has been updated to show off this behavior:
   

3. Finally, some minor UX changes to hide cpu/gpu timing when it's not available and the ability to tune what is considered a missed frame or not.

Changes

• Fixes: Positioning is difficult. Please improve. #32

Verification

This optional section is a place where you can detail the specific type of verification
you want from reviewers. For example, if you want reviewers to checkout the PR locally
and validate the functionality of specific scenarios, provide instructions
on the specific scenarios and what you want verified.

If there are specific areas of concern or question feel free to highlight them here so
that reviewers can watch out for those issues.

As a reviewer, it is possible to check out this change locally by using the following
commands (substituting {PR_ID} with the ID of this pull request):

git fetch origin pull/{PR_ID}/head:name_of_local_branch

git checkout name_of_local_branch