clang-dev_libcxx_unity_xtra warnings for Arx in branch master

• (ungrouped warnings) (1 | =)
• -Wimplicit-int-conversion [docs] (53 | =)
• -Wshorten-64-to-32 [docs] (111 | +3 -3)
• -Wold-style-cast [docs] (151 | =)
• -Wimplicit-int-float-conversion [docs] (197 | =)
• -Wpadded [docs] (288 | =)
• -Wzero-as-null-pointer-constant [docs] (639 | =)
• -Wsign-conversion [docs] (655 | =)