Introduced MissionItemEditCell

 - to replace brittle tag based lookup
Merge branch 'idiomatic-table-view-cells' into idiomacy-pass
NSInteger -> NSUInteger on consume/produceData
id -> instancetype
Correct formatting warnings on 32/64-bit
CustomPointAnnotation - ivar -> property
MavLinkLogger - ivar -> property
Merge pull request #113 from fightingwalrus/idiomacy-pass

Idiomacy pass