* reduced scope in B_IsBuildingBuiltUp
* converted B_CheckBuildingConstruction to boolean and reduced cyclic complexity
* use Q_strvalid in B_FireEvent
* whitespaces and minor cleanup
* merged two if branches + const in B_UpdateAllBaseBuildingStatus
* reduced cyclic complexity in some MSO_* functions
* fixed typos
* reduced indention
* reduced scope + const
* reduced cyclic complexity in B_MoveAircraftOnGeoscapeToOtherBases
* reduced scope + const
* fixed bug #3415 - (Game doesn't pause on buiding built up if it is yet unusable)