E Whiter Bu2KDarkScalar, DarkScalar2hh, hh: KK or pipi (new AP, superceeds old AP b2k_s2kk)

• B^+ \rightarrow K^+ S( \rightarrow hh), where S represents a long-lived dark scalar
• hh: K^+K^- and \pi^+\pi^-
• 2018 Run 2 data
• Using stripping lines: StrippingB2KX2KKDarkBosonLine and StrippingB2KX2PiPiDarkBosonLine
• WG: QEE
• New analysis production
• Old production for just darkScalar2KK can be archived (see MR !781 (merged))
• Changes compared to previous AP: added \pi^+\pi^- data

Closes !910 (closed)