bool improvements (related to mixing bool/sal_Bool in &=, |=, ^=)

Change-Id: I9869d9709f28b68ef7b518527175589d80644668
implicitboolconversion: also warn about mixing bool/sal_Bool in &=, |=, ^=

...as MSVC would warn about those anyway.

Change-Id: If22dfd35bc01aff1a1bef68702c616e711db42fb