Crash on resume when pause in reset

[Rauks]

A lock check is probably missing on resume/restart method. Pause may not clean resume properly or resume call a duplicate start sequence.

[Rauks]

To test :

BaseGameScene

• put pause() synchronized
• put resume() synchronized
• check pause status on pause and resume to avoid cross calls
• release isPaused in the end of resume (actually on begin)

Pause must be tested during game, on restart (during rollback jump), on start, on paused, on pause resume. Stress pause/resume must be reperformed (precedent fix done here)