Replace mapper fieldPF stuff with CSS transforms.

The fieldPF things are separately deprecated in Lift 2.6.
Meantime, fieldMapperPF is replaced by
fieldMapperTransforms, addSnippet/editSnippet/viewSnippet
by addFormSnippet/editFormSnippet/viewTransform, fieldPF
by fieldTransforms, appendField/prependField by
appendFieldTransform/prependFieldTransform.
Rip out BindHelpers.xbind, which was deprecated.
Clear a postfix operator warning in lift-json.
Fix up some unnecessary casts in BCrypt.

javac was throwin’ some warnings about them.
Suppress an unwarranted warning in A.java.

The SaveVarags annotation didn’t seem to work for some
reason?
Merge pull request #1547 from lift/x-nay-to-the-ind-bay

X-nay to the ind-bay: Remove BindHelpers.xbind, plus a couple of extra warnings