Rooted forest Overhaul for v0.7 (rebase + tweaks)

[Frostwithasideofsalt]

wip (successor to #3305), also contains more backgrounds.
Fixes #1017
Closes #3129

Issues:

• Tackle unfinished or incorrectly looping backgrounds

• Floral Blossom - Broken scripting

• Floral Blossom - Misaligned water levels

• Granito Village - missing music

• Drop The Ball - missing music

• Flooded chambers - wind isn't set to current

• Flooded chambers - Granito bugs (on slopes) -> Awaits Fix granito movement propagation #3441

• Hollowed earth - disable fancy animations for the first cutscene (check scripting reference)

• Fix visibility problems in the Rooted Tower (this one in particular sucks - the pillars look too much like they're solid)

• Fix forest worldmap script

• Try to adjust visibility of the corrupted forest to the best of our ability.

• Ensure that every level has a target time.

• (?) Change all level credits to The SuperTux Team

[serano01]

Why is removing of the halloween- and christmas-levels part of this PR (instead of improving it for 0.7)? At least the halloween levels should be kept since they feature an unique tileset.

[bruhmoent]

Why is removing of the halloween- and christmas-levels part of this PR (instead of improving it for 0.7)? At least the halloween levels should be kept since they feature an unique tileset.

Those levelsets are not up to par with the modern standards. They're gonna be re-added once new and polished versions get made — that's in the plans for 0.7.1.

Trying to work on them right now would unnecessarily delay 0.7 even further.

[bob456545]

There will be cutscenes in the Rooted Forest world yes or no

[Hypernoot]

The level Floral Blossom is impossible right now. In the final cutscene, the level just hangs and nothing is happening. It cannot be even skipped. Other than that, saving the last group of granitos require terrible backtracking and then Tux is not given any instructions on what to do. There should be at least a message like: "You saved all the granitos, now go back to the entrance of this chasm."

[Hypernoot]

• one tile wrong close to Tux

• no sign under the cruser

• missing trampoline sign

• buggy background

• wrong billboard

• missing signs under crushers

• Aha, maybe I should have brought rocks instead. There is no sign.

• missing sign under crusher

• Thanks for info, but you have already told me two levels before.

• bugged background (see very top)

• missing sign under crusher

• same here

• missing rock sign

• missing crusher sign

• same here

• same here

• missing rock sign

• missing crusher sign

• same here

• missing rock sign

• same here

• dancing doors

• skip cutscene doesn't skip it whole

• dancing doors

• bugged background (see very top)

• It is really hard to tell what is solid. Also a sign would be handy here, because I didn't know that I'm supposed to jump into the hole.

• dancing doors

• same here

• invalid music reference

• dancing doors

• missing crusher sign

• but I have saved only one at this point...

• missing rock sign

• I didn't find any better way to solve this, except bringing rocks. I need to bring three rocks from above, which requires terrible backtracking. Each time I die, I need to start over. I gave up on this and used cheats.

• The final cutscene of Floral Blossom gets stuck on this screen forever, so it's unfinishable.

• wrong level reference - it should now use the level introduced in the ghosttree pull request