Merge Charm_Xic2PHH_2018-patches

This request intends to add hadronic decays of charmed hadrons. We have tested their rates and you can find them in the following.

The number of input events is 10000.

Decay	Stream	Line Name	Rate (%)	Accepted	Mult	Timing(ms/evt)
\Xi_c^+\to pK^+K^-	Charm	StrippingXic2PHHXicp2PKKLine	0.08	8	1.000	0.030
\Xi_c^+\to p\phi(1020)	Charm	StrippingXic2PHHXicp2PPhi2KKLine	0.01	1	2.000	0.023
\Xi_c^+\to p\pi^+\pi^-	Charm	StrippingXic2PHHXicp2PKPiPiLine	0.43	43	1.047	0.036
\Xi_c^+\to pK_s^0	Charm	StrippingXic2PHHXicp2PKS0LLLine	0.10	10	1.000	0.016
\Xi_c^+\to pK_s^0	Charm	StrippingXic2PHHXicp2PKS0DDLine	0.22	22	1.045	0.020