Frontend: Lead first-time player to training page on start

the clipping was just due to remote abuse anyway - this addresses a couple of the concerns from the bug

Update README about the Hedgewars training

Remove unused, unfinished and outdated boot camp mission

Complete overhaul of Basic Rope Training NEW lesson plan: - Select rope - Shoot rope, attach, detach - Extend, retract, swing to reach easy target - Multiple shots / rope re-use to go over water hazard - Drop grenade from rope - Special rules when you only got 1 rope (also when the rope is officially used up) - Rope around obstacles and mines

Change misleading server error message about nicknames

Capitalize default hog names and server name

More user-friendly server messages

Fix frontend error dialog always displaying "failed" as last engine message after engine crash

Having chat mode as game state was a mistake

Remove dead code from basic bazooka training

Completely redo Basic Grenade Training Lesson plan: - Select grenade - Throw grenade - Aim, set timer, set bounciness - Destroy targets

Basic Movement Training: Fix inconsistent help texts when switching Cappy a 2nd time

Complete redo of Basic Bazooka Training This is now a proper tutorial instead of just a simple target practice without any commentary. It teaches players how to use the bazooka, how to deal with wind and how water skip works.

Add "Turning Around" to movement training

Some minor convenience improvements in Basic Flying Saucer Training