Increase version to 1.48 in preparation for new release

Updates for Windows 10 Creators Update

- Install the latest (10.0.15063.137) version of xperf/WPA
- Retire the automatic symbol stripping/downloading script
- Support the new thread naming API
- Update the version number
- Updating the packaging script so signing happens before copying

The symbol stripping/downloading API can be retired because the latest
WPA seems to properly download Chrome's symbols, and can convert them
in a timely manner.

Increase version to 1.46 in preparation for new release

Update file exclude list for package_etw.bat

Increase version to 1.44

More error checking in package_etw.bat

Add source indexing to package_etw.bat

This change uses https://github.com/Haemoglobin/GitHub-Source-Indexer.git
to source index the UIforETW PDBs so that debugging will automatically
download the correct source file.

This change also creates an etwsymbols.zip file which will be uploaded
with subsequent releases.

Remove reference to often-nonexistent file

Check for existence and version of symsrv.dll

The Windows 10 Anniversary Edition of WPA requires that symsrv.dll from
the Debuggers directory be installed. This will normally happen
automatically (when the Windows SDK or VS 2015 are installed) but it is
not actually guaranteed. This adds checks for the existence and a
minimum version of symsrv.dll in the Debuggers directory.

If a significant number of people hit this check then I could bundle
the installers, but for now I'm not going to because I don't want to
add another 26 MB to the release zip files.

Increment version number from 1.32 to 1.40

The code that checked for new versions was discarding the last digit of
the version numbers that it read from the releases web page. This means
that it wouldn't notice new versions until the 0.1 column changes. So
I'm changing it. Apologies for the hack. The version checking code has
been fixed so incrementing the 0.01 column will be sufficient next time.