*Tracking* Enhancements to support plant templates

[AntoineGautier]

This is a tracking issue listing all the sub-issues required to support the plant templates in ctrl-flow.

• Fix evaluateExpression for proper handling of literals VS instance names #554
• Add parsing for element_sections in LongClass #494
• Remove dead end in parser for __ctrlFlow(enable=false) and enable=false #492
• Multiple extends clauses not supported #507
• Declaration-level choices annotation disregarded #552
• Final keyword disregarded #418