LINE TEXT INFO PAGE: Create form for each line

[georgekouts108]

For each line of text that will be shown on the screen, you must specify:

• RepeatsPreviousTextShown
• TextShown
• TextHeard
• IndexesOfShownWordsSung

[georgekouts108]

NEXT STEP: Let the user clone existing lines (so they could avoid, for instance, re-entering all the text/info for the chorus).

[georgekouts108]

NEXT STEP: Edit the frontend for the line entry form

• UPDATE: frontend edited in a4f4e91 ✅