0.4.0

Support for Wren 0.4.0

Wren 0.4.0 was released a while back with lots of good changes, see the details here.
https://github.com/wren-lang/wren/releases/tag/0.4.0

There were various fixes and additions to the CLI, some listed below.

Partial change list:

• Format help output by @vladimyr in #30
• Upgrade libuv from 1.34.2 to 1.38.0 by @vladimyr in #32
• Python script to regenerate projects using premake by @vladimyr in #37
• Implement Process.cwd by @vladimyr in #41
• Implement Process.version by @vladimyr in #42
• Updated Process.arguments to only return slice if arg count >= 2 by @txgruppi in #61
• parity between ALLOCATE and FINALIZE by @joshgoebel in #82
• Implement Process.pid & Process.ppid by @vladimyr in #43
• Improve file/directory utils by @joshgoebel in #84
• Implement Platform.homePath by @vladimyr in #48
• (chore) Finish the Scheduler.await_ work by @joshgoebel in #100
• (fix) properly escape backslashes in embed Wren source inside C by @joshgoebel in #112

Full Changelog: 0.3.0...0.4.0