Updated Previous tutorials to be consistent

Added a description and made sure translatable tags start with id_
Updated internationalization instructions
Organize Imports
Added between-tutorial-memory

This can be for minor UI things, mainly in the mistake handling.  In the
future, instead of holding booleans, this could hold Dates, so that if
this info has "worn out", then we pretend it is false.
Added persistent memory for Blocking Tower
Tut0 behaves differently if player tries to skip placement.

Also, a bit of refactoring and the fixing of a potential infinite loop.
Polishing Tutorial 1

Coaching the skip ahead a bit better
Fixed bug where bad placement off grid caused Tux to yell.
Tutorial is a bit more customized

Won't remind user to push continue button if they've already been
coached.  Also, Tutorial 1 now goes to the end of round 2.
Added conditional bad-tower-detector

to the tutorial 1.  We'll only remind them if they didn't do it earlier.
Also, the are you sure really only prompts once now
Stub for first Starred Tutorial
Merge branch 'story_new_tut' into story-update