Use NormalizeSequence in RenderBuildingWall.
Move WithFire, Burns offsets into sequences.
Move SatelliteLaunch offsets into sequences.
Move RallyPoint offset into sequences.
Remove obsolete SpriteRenderable ctor.
Merge pull request #3450 from pchote/offset-sprites

Allow sequences to define sprite offsets
remove some plenks

no logic changes
Attack the center of the cell instead of the top left corner

to not discriminate bottom right directions. Fixes #2205
Merge pull request #3439 from Mailaender/kill-cargo

Kill Cargo properly
Merge pull request #3429 from Mailaender/dont-crash-on-drop

Don't crash when the player to drop can't be found.
Merge pull request #3452 from Mailaender/center-range

Don't discriminate bottom right directions when checking whether a unit is in range.
display the last ServerError in the connection failed dialog

closes #2727
fix some plenks

no logic changes
inform the user which sound engine is used
Lobby, Add Bots button
Simplify and increase robustness of Shroud et al. Fixes #3440.
Add an extra sanity check.
Only update vis for actors in the world. Fixes #2726.
Merge pull request #3420 from Mailaender/sound-info

Display the current sound engine in the console
Merge pull request #3441 from Mailaender/display-server-error

Display ServerError in CONNECTIONFAILED_PANEL