Sprint 34 Add Maya LT integration

NEW FEATURES

• Ship all C# scripts as source code

• Added Maya LT Integration

Replaced Maya python implementation with MEL script, which is used by both Maya and Maya LT.

NOTE: it is no longer possible to unload the plugin using Maya's plugin manager.

• Export Settings: Added option to launch 3D application after installing integration

• Export Settings: Added option to export FBX as ASCII or Binary

• Export Settings: Added integration unzip location field

Use new field to select where to unzip the integration zip file, instead of being asked each time
"Install Unity Integration" button is clicked.

• Add environment variable (UNITY_FBX_3DAPP_VENDOR_LOCATIONS) to allow searching alternative vendor locations e.g. /Users/inwoods/Development/AltVendorLocation/Autodesk/

FIXES

• Export Settings: Moved "Browse" button out of the dropdown
• Unity 3ds Max Integration: Added tooltips to the import/export menu items
• Export Settings: Align checkboxes, text fields, and dropdown
• Fbx Prefab: Add tooltip to "Source Fbx Asset" field
• Export Settings: Search for 3D applications in multiple vendor locations (e.g. C:/ and D:/ drive)