include-what-you-use warnings for Arx in branch 1.1-branch

• -Wfor-loop-analysis (1)
• -Wimplicit-int-float-conversion (1)
• -Wunused-private-field (1)
• -Wdeprecated-copy (2)
• -Wunused-const-variable (2)
• -Wdeprecated-declarations (4)
• -Wlogical-not-parentheses (5)
• -Wmisleading-indentation (7)
• (ungrouped warnings) (89)
• unneeded-include (235)
• missing-include (1274)