Custom parser can handle nested ICU messages even if they
are split into multiple fragments. Code reworked to encapsulate
all pseudolocalization logic in Pseudolocalizer and PseudoMethods
classes. To minimize a changelist size, some static functions
remained. Fake BiDi pseudolocalization method is reimplemented
to handle word boundaries correctly. Unit tests added.
Change-Id: I9fb4baf4e3123df5dd6d182cca02bb7b0489ca71
cbb1e676b5