Fix links in README
Make editor help translatable
Add color the shell name.

The bug in #166 is actually that the second shell is red instead
of green as required in the XML. This will be resolved later,
hopefully.
Make the second shell now the green one. Fixes #166.
Add contributing note to README
Change display for datahead8888; remove duplicate for Brian Vanderburg/simpletoon; move sauer2 to active status
Merge branch 'release-2.0.0' of https://github.com/Secretchronicles/TSC into release-2.0.0
Interestingly, boost was not mentioned as a dependency, despite being quite large.
boost_thread is named boost_thread_win32 only when crosscompiling.
Update yellow boxes (except power block) and settings files

Including:
* Default crate
* Brown1_1
* Bonus crate
* Spin crate
Non SMB power up items graphics and settings

Including replacements for:
* Size mushroom (green fruit)
* Fireplant (firefruit)
* Ice mushroom (ice fruit)
* Ghost mushroom (ghost fruit)
* Poison mushroom (rotten fruit)
* 1 up mushroom (extra life fruit)
Replace SMB coins with gems graphics + settings files

Including:
* Yellow coin (blue gem)
* Red coin (red gem)
Update ground_3 graphics and HUD Coins image
Grant the player a tiny second of invincibility when hitting big pip, and offset him slightly. Fixes #216.

This ensures that a) the player does not immediately get hit by one of
the two little pips that are created (which is very hard to avoid
without this invincibility period), and b) that the player does not
get stuck on one of the pips, which previously happened easily when
you jumped onto pip at the left edge.
Merge branch 'release-2.0.0' into devel
Merge branch 'bugsbane-graphics-next' into release-2.0.0
Beta version bump
More informative descriptions for m_rot_x and m_rot_y.
Load right-jump image instead of right-fall image on jumping rightwards. Fixes #107.
Ensure crates don’t hang in the air after they killed an enemy.

Cf. ticket #226. This commit does not solve the problem entirely,
because for some reason a falling crate doesn’t always kill the
enemy below as it should do. It then lies on the enemy and gets
carried around by it. If you kill the enemy (e.g. by fireball),
the crate will hang in the air again.