Performance update for 1.0

[DamienMosier]

• restore the lazy loading and constructors but only for measures with context defined
• add lazy null handling

Current 1.0

ADD-E: Duration: 3h 32m 35s CRE: Duration: 2h 46m 1s PND-E: Duration: 10h 48m 39s SPD: Duration: 3h 10m 21s

With these updates

ADD-E: Duration: 38m 0s CRE: Duration: 57m 4s PND-E: Duration: 53m 39s SPD: Duration: 1h 36m 22s