Remove beacon from ion cannon and add to airstrike. Fixes #4732.
also check map.yaml Sequences:

closes #4765
Renamed AttackTesla into AttackCharge and improved it.

Delay for initial charge is no longer hard-coded and can be customized now.
Same for delay between each charge.
Changed default MaxCharges to 1.
Added descriptions (except for MaxCharges since it's self-explanatory).
Adapts Tesla Coil and Obelisk to AttackTesla -> AttackCharge changes.

Fine-tunes Obelisk charge delay, adds changelog entry.
Un-hardcodes charge sequence name.
Chinook rotors now counter-rotate as intended.
CHANGELOG entry for counter-rotating chinook rotor blades.
Renamed Flak Truck to Mobile Flak
Merge pull request #4805 from reaperrr/chinook-rotor

Makes Chinook rotors counter-rotate
Merge pull request #4768 from Mailaender/map-sequences

Fixed map.yaml sequences being ignored
Remove hardcoded missions
Update CHANGELOG for removal of hardcoded missions
Remove some RA maps
Update CHANGELOG for removed maps
Fixes unused fields.
Adds UpgradeRule for AttackTesla -> AttackCharge.
Merge pull request #4815 from pchote/beacons

Remove beacon from ion cannon and add to airstrike.
Merge pull request #4812 from cjshmyr/ftrk

Renamed Flak Truck to Mobile Flak
Merge pull request #4817 from ScottNZ/mapcull

Map cull
Merge pull request #4803 from reaperrr/obelisk-fix2

Building charge improvements