in the ttcn3_dut application many "virtuaL" UE instances are created and
destroyed when executing the tests.
With the previous limit of 12 handlers the application stopped after
a few tests. With the limit raised to 256 we should be able to run
all white_listed TTCN3 tests for the UE without problems.
This fixes#3886
Make PCAP handlers deregister from this list when they are destructed. This avoid the signal handler calling destructed objects under very rare circumstances.
Move emergency handlers header file into the support folder.
Refactored signal handling:
- Remove the dependency with the running static variable in the header file.
- Move implementations down to cc files.
- Allow specifying a new signal handler that will be used to stop the applications.
- Move signal handling files to support.