Better prompts and optional free space to replace main point question

• Updated prompts to sustain active thinking for the whole sermon. Moved "main point" section to the bottom and replaced it with a "free space" for more flexibility. Tweaked printout sheet for subtle change cues.
• Version "1" included many "pure fun" prompts from kids that we kept just for the start (there was a longer-term plan in mind since the beginning).
• Now also works offline!