Fix for windows users with space in tsc path

[foohines]

This fixes the issue #60 which occurs when:

• The user is using windows
• The path to the user's tsc.cmd includes a space e.g
  C:\Users\foohines\code\dir with space\node_modules\.bin\tsc.cmd

This fix works by:

• Wrapping the tscPath in double quotes if it contains a space (passed as spawnSync's first argument)
• Wrapping the projectArg in double quotes if it contains a space (passed in spawnSync's second argument)
• Setting { shell: true } option to spawnSync for windows users only

More context can be found in the node documentation on how to correctly spawn windows .cmd files

[jonasgeiler]

Shouldn't setting shell to true be enough? I tried fixing it in my fork: https://github.com/skayo/tsc-files
Will see if I open a PR, but for now I'll publish my fork as it's own package (@jonasgeiler/tsc-files)

[foohines]

I don't think so. I tested your fork and my own with just shell: true, and when a windows user has a space in their tsc path, it still fails with the same error.