Some fixes for Static Mover Decals

[SilverDorian46]

• the Static Mover Decal Registry Handler now properly accepts the jumpThrus attribute.
• the Static Mover's OnShake callback now calls OnShake of each of the Decal's solids, if it has any. this ensures that entities attached to those solids have the same visual shake as well.
• the Static Mover's JumpThruChecker has a typo fixed: (int) X + y -> (int) Y + y
• a new event EntityList.PostAwake has been implemented. this is called at the end of EntityList.UpdateLists(), at which point it is exchanged for null. any additions to PostAwake during its invocation will be called the next time UpdateLists() is called.
• the Decal's Static Mover check on Awake has been delegated to the PostAwake event.
• there is now a public getter for Decal.solids.
• calls to Destroy-, Disable-, and EnableStaticMovers are included where appropriate.