Create a full Windows package

[larsbergstrom]

Few changes here to the package, mainly:

1. Include servo.exe
2. Change servo.sh to servo.cmd and format it properly
3. Include all of the mingw redistributables so that we can launch Servo

There are still some issues (mainly related to font loading), but at least this is 99% of a Windows build :-)

Fixes #12523

r? @edunham

cc @metajack (cribbed from his DLL list in his MSI PR)

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• ./mach build -d does not report any errors
• ./mach test-tidy does not report any errors
• These changes fix #__ (github issue number if applicable).

• There are tests for these changes OR
• These changes do not require tests because _____

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This change is

[highfive]

Heads up! This PR modifies the following files:

• @wafflespeanut: python/servo/package_commands.py

[waddlesplash]

It'd be nice if we got the list of DLLs programmatically, but it looks like there's no easy way to do that (Qt has a tool that does this called "windeployqt", but it looks like that actually reads the PE files itself.) I'll poke around later, I suppose...

[KiChjang]

$ ./mach test-tidy --no-progress --all

Checking files for tidiness...

./python/servo/package_commands.py:190: E123 closing bracket does not match indentation of opening bracket's line

./python/servo/package_commands.py:199: Line is longer than 120 characters

[larsbergstrom]

Closing in favor of just landing #11967