Cosmetics (to ease work related to finding unused functions)

Change-Id: I88b7659fdfdcba43e69ef7489573b28952c8328c
Properly cover in #ifdef TIMETESTS

Change-Id: Iff8f992e5260150b9ba108698b506f5a9ec7dea2
C++11-only stdint.h SIZE_MAX -> std::numeric_limits

Change-Id: I6bf80d034490583afa9e51cf720703cdf60a924a
Redundant null checks

Change-Id: I8b38d37de6cba2a29c9d785adf17d65835c8a05d
Remove unnecessary SubsetterContext base class

Change-Id: Ia000655f3fe49a4c9c1015b37f44c0ba44d7666e
Remove unused getText

Change-Id: I13145c4dcdf95d7979dc1887ba08a243f8b5a224