Traceur: Change output filename to trace-[identifier].ctrace

This is for two reasons:
- Removing 'traceur' from user visible strings since this app is called
System Trace to the user.
- Changing the file extension to the made-up 'ctrace', for 'compressed
trace', since .txt was straight up inaccurate.

Bug: 64759304
Test: Created a trace, verified that the output filename was what I
expected. Tests pass.

Change-Id: I8ef5cfb139bc532ed6fe5f70d3811825dce4e98a
1 file changed
tree: e4434d47668210f03d659989bf1ee924e1c783a1
  2. AndroidManifest.xml
  3. res/
  4. src/
  5. uitests/