Merge pull request #1341 from seanpaultaylor/next

Minor changes in TerrainSample
Added support for encoding multiple font sizes into a single GPB with gameplay-encoder.
Font class and related text rendering was updated to support multi-font GPBs.
Tweak to multi font size support.
Merge pull request #1342 from sgrenier/next

Support for multiple font sizes per Font
Fixed issues in textured shader when using bump mapping and spot lights.
Merge pull request #1344 from sgrenier/next

Fixed issues in textured shader when using bump mapping and spot lights.
Fix to gameplay-encoder to produce better looking fonts at certain sizes.
Merge pull request #1345 from sgrenier/next

Fix to gameplay-encoder to produce better looking fonts at certain sizes.
Changed sample browser arial font to use 24 as the default size instead of 8.
Merge pull request #1346 from sgrenier/next

Changed sample browser arial font to use 24 as the default size instead of 8.
Fixes repeating MaterialParameter warnings each frame to only log once for missing uniforms and unset parameter values.