Patch 1.2.1

• Upgraded to UE 3.1 API.
• Fixed bugs in text.serialize.
• Fixed path resolving in shell.
• Fixed item file system labels not being saved.
• Added os.getenv and os.setenv and moved a couple of things to env vars.
• Added localization for Traditional Chinese (thanks mymagadsl).
• Added a couple of programs (components, set, unset).
• Improved checks for item use and drops for robots, handling hopefully all scenarios now.
• Many more small fixes and improvements.