REFAC: Adds bilinear interpolation toggle to Textures

Linear interpolation should be default in all textures. This also adds a toggle for it. This is partly a bug since it should definitely be on.

If you run old RenderingExample.cpp vs this one and zoom all the way you can tell the difference.

PR Checklist

• No API changes were made (or the changes have been approved)
• No major design changes were made (or the changes have been approved)
• No new dependecies were added (or the new dependencies have been approved)
• Added test (or behavior not changed)
• Updated API documentation (or API not changed)
• Ran the CodeFormatEnforcer task and verified the header is in all new files
• Added iMSTK examples for all new major features (if any)