GPII-3620: Using 7-zip to compress most files.

[stegru]

(experimental)

I got tired of waiting for the installer build to complete, so I've had a quick try at speeding it up.

Instead of wix having to handle over 28,000 files, I made the build use 7zip to put most of the files into a single archive - I'm now able to make a test build in less than a minute - also able to make an installer half the normal size (takes a little longer). This isn't quite ready for production - the installer opens a console window and it doesn't fully uninstall.

@javihernandez, do you think it's worth making it work for releases?

Results:

Original:

size: 223MB
build:       00:07:21.5286101 (MSBuild: 00:05:31.17)
install:     00:01:32.2459532
full repair: 00:03:21.3451461
uninstall:   00:02:08.1704199

$ENV:Compression=1:

size: 228MB
build:       00:02:42.0773036 (MSBuild: 00:00:44.50)
install:     00:00:29.4785606
full repair: 00:00:27.5278058
uninstall:   00:00:02.5061369

$ENV:Compression=9:

size: 118MB
build:       00:06:08.4280582 (MSBuild: 00:04:19.28)
install:     00:00:27.2954481
full repair: 00:00:27.7457903
uninstall:   00:00:02.2500641