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Remove unused, unfinished and outdated boot camp mission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