36f7f3ca82
Add copyright headers in a few files where they were missing. Trim trailing blank comment line where present, for consistency with other engine code. Use the standard libtxt copyright header in one file where it differed (extra (C) and comma compared to other files in libtxt). This also amends tools/const_finder/test/const_finder_test.dart to look for a const an additional four lines down to account for the copyright header added to the test fixture.
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