Customise launch sites

Added relevant launch sites, removed non-relevant. Added altitude values for existing relevant sites.

**Added**
* SHARP/BLAST
* New Forest (POP)
* Beacon Hill, South Downs
* Woodgarston Farm

**Removed**
* Adelaide
* Boston Spa
* Wistow
* Cookstown
* Preston St Mary

**Updated Altitude**
* Churchil
* Elsworth
* Brightwalton