clang-dev_libcxx_unity_xtra warnings for Arx in branch 1.1.2-r2

• -Wimplicit-int-float-conversion [docs] (1)
• -Wunused-private-field [docs] (1)
• -W#warnings [docs] (1)
• -Wconstant-logical-operand [docs] (2)
• -Wdeprecated-copy [docs] (2)
• -Wdeprecated-declarations [docs] (2)
• -Wlogical-not-parentheses [docs] (5)
• -Wmisleading-indentation [docs] (7)