Evaluate and include all valid modifiers with unit.

Handle special symbol modifiers to remove them when values are set
to blank.
Address formatting issues from pull request 385.
Merge pull request #385 from virtual-world-framework/validate-unit-modifiers

Evaluate and include all valid modifiers with unit.
Remove white bands from bottom and right of window
Allow app to get and set dragBoundFunc
Insert some missing quotation marks
Merge pull request #386 from virtual-world-framework/branch/keep-stage-in-window

Branch/keep stage in window
Add basic shader material support
Cleaned up shader example
Modified example shader
Updated example
Address PR comments
Added mix map example
Use optimized loop