hotfix for v0.29

hotfix for v0.29:

• coop: fixed random maps always starting in full-pause mode
• fixed level design issues in several missions
• fixed crash related to detonation of timebombs
• fixed crash that would happen on replays for random missions
• fixed crash when equipping a certain inventory item
• editor: disabled screen edge scroll when dragging interface items (such as position/origin)
• editor: solid/vision/movement block flags are adjusted depending on object height (all flags removed if below ground, vision block/solid removed if below line-of-sight etc)