add XT60 connectors

connector/xt60.yaml

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+name: XT60
+variations: M, F
+description: Amass XT60 battery connector
+keywords: connector
+distributors: LCSC C98734
+
+pinout@F:
+  +: 1
+  -: 2
+
+pinout@M:
+  -: 1
+  +: 2
+
+schematic:
+  symbol: connector
+
+housing:
+  pattern: custom
+  bodyWidth: 8.10
+  bodyLength: 15.50
+  height: 15.70
+  silkscreen: M -4.05 5.05 -1.35 7.75 1.35 7.75 4.05 5.05 # the notch on -
+
+  # pins
+  leadDiameter: 4.3
+  holeDiameter: 4.5
+  padDiameter: 6.0
+  pitch: 7.20
+  rowCount: 2
+  columnCount: 1
+  rowDX: 0
+  rowDY: 0

connector/xt60pw.yaml

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+name: XT60PW
+variations: M, F
+description: Amass XT60 battery connector, 180°
+keywords: connector
+distributors: AliExpress 33057941704
+
+pinout@F:
+  +: 1
+  -: 2
+
+pinout@M:
+  -: 1
+  +: 2
+
+schematic:
+  symbol: connector
+
+housing:
+  pattern: custom
+  bodyWidth: 15.5
+  bodyLength: 17.2
+  height: 8.4
+
+  # pins
+  holeDiameter: 2.7
+  pitch: 7.20
+  rowCount: 1
+  columnCount: 2
+  rowDX: 0
+  columnDY: 6.75 # 17.2/2-1.85
+
+  # mounting holes
+  slotHeight1: 1.7
+  slotWidth1: 0.6
+  pitch1: 13.5
+  rowCount1: 1
+  columnCount1: 2
+  rowDX1: 0
+  columnDY1: 0.75 # 17.2/2-1.85-6
+