Add maze builder functionality.
[Finishes 68301834] Pong -> Bounce
[Finishes 68245530]: text change
[Finishes 68301870]: hideShowCode changes
[Finishes 68245434]: remove ideal block count
Built Results
[Finishes 68301870]: PR feedback + use enableShowCode for feedback dialog as well
Merge pull request #462 from code-dot-org/pivotal_68245434_68301870

Pivotal 68245434 68301870
Pong -> Bounce
Set explicit start positions for stage 11 puzzle 3 and stage 11 puzzle 4
Merge pull request #463 from code-dot-org/pivotal_68328010

Set explicit start positions for stage 11 puzzle 3 and stage 11 puzzle 4
Update README.md
Stop counting un-placed blocks for auto-positioning. Trim XML string before parsing. [fixes #68328010]
Merge pull request #464 from code-dot-org/pivotal_68328010

Fix auto-positioning of blocks with dirty XML input.
Experiment on Feedback design pattern.
Merge pull request #465 from code-dot-org/feedback_collect

Experiment on Feedback design pattern.
Minor style changes.
Merge pull request #466 from code-dot-org/feedback_collect

Minor style changes.
Built Results
blockly changes for dropdown change