Queueing commands after a morphing command cancels the morphing.

[Rampoina]

Current behaviour:

1. Give a unit a morphing command
2. Give the morphing unit a shift command (to move or to attack move for example)
3. The morphing stops and the other queued commands start

Expected behaviour: 3. The queued commands start after the unit is morphed.

[pavanvo]

@Rampoina I was thinking, this PR are solving this issue #215

[Rampoina]

@pavanvo unfortunately it doesn't, I tried