editeng: sal_Bool->bool

this had to be done in conjunction with changing
  include/svx/unoshtxt.hxx
because there are two virtual methods "bool IsValid" in two different
base classes and some subclasses are overriding both base-class
methods at once.

Change-Id: Ib43fc5000b443057caaa513b4efeaa6fd16e4260
editeng: sal_Bool->bool

Change-Id: I0aa375d35c796cfa1929f9c0e735eaaa05561ee4
editeng: sal_Bool->bool

Change-Id: I26b1fe14023737b85bcf23628e4881c8be79f071
editeng: sal_Bool->bool

Change-Id: I4fc276e320294d57eb667b6db8e5eff078bc28b3
editeng: sal_Bool->bool

Change-Id: I767aa3d25f6d18e8a6e23b4d3f8d038d581ac292
editeng: sal_Bool->bool

Change-Id: Icfda5e8e774b9b5a6c3d99b636e4ce772b93139d
editeng: sal_Bool->bool

Change-Id: I51b4ae54c2c440d38879439f74d4fea39d243004