simplify decoding
deleteMembers by default if decoding doesn't work
minimal fix of String_deleteMembers - will save about 32bit of the executable
declaring the borrowed vtable at runtme in the ua_application.c

saves about 20kb in the final stripped executable

where would be the right place to do such declarations?
Merge pull request #102 from acplt/generate_borrowed_at_runtime

declaring the borrowed vtable at runtme in the ua_application.c