Remove old resource scripts and build all pages with BBCode parsing

[Razoric480]

Stacked onto #1241, to be collapsed at merge time.

• Deletes all of the old Resource scripts for content blocks and removes the need for an intermediary resource between BBCode and runtime, and use BBCode directly to build and setup all pages.
• Deletes the bbcode translator, as the Resources it referenced no longer exist, and all lessons have already been fully converted
• Adds a BBCodeUtils static class to make accessing information less verbose within the parsed lesson
• At recommendation, removed the content ID tracking for text blocks - should still keep track of and restore quiz IDs.

Made a test export and made sure that the course still worked.

[NathanLovato]

Cherry picked and merged manually after #1241