SpamFilter plugin still using ITemplateStreamFilter

[paul@…]

The SpamFilter plugin is still using the deprecated ITemplateStreamFilter API and so won't work with trac 1.5.x:

running build_ext
Traceback (most recent call last):
  File "setup.py", line 95, in <module>
    **extra
  File "/usr/lib/python2.7/site-packages/setuptools/__init__.py", line 145, in setup
    return distutils.core.setup(**attrs)
  File "/usr/lib64/python2.7/distutils/core.py", line 151, in setup
    dist.run_commands()
  File "/usr/lib64/python2.7/distutils/dist.py", line 953, in run_commands
    self.run_command(cmd)
  File "/usr/lib64/python2.7/distutils/dist.py", line 972, in run_command
    cmd_obj.run()
  File "/usr/lib/python2.7/site-packages/setuptools/command/test.py", line 229, in run
    self.run_tests()
  File "/usr/lib/python2.7/site-packages/setuptools/command/test.py", line 251, in run_tests
    exit=False,
  File "/usr/lib64/python2.7/unittest/main.py", line 94, in __init__
    self.parseArgs(argv)
  File "/usr/lib64/python2.7/unittest/main.py", line 149, in parseArgs
    self.createTests()
  File "/usr/lib64/python2.7/unittest/main.py", line 158, in createTests
    self.module)
  File "/usr/lib64/python2.7/unittest/loader.py", line 130, in loadTestsFromNames
    suites = [self.loadTestsFromName(name, module) for name in names]
  File "/usr/lib64/python2.7/unittest/loader.py", line 91, in loadTestsFromName
    module = __import__('.'.join(parts_copy))
  File "/builddir/build/BUILD/TracSpamFilter-1.5.0dev-r17344/tracspamfilter/__init__.py", line 17, in <module>
    from tracspamfilter.filtersystem import *
  File "/builddir/build/BUILD/TracSpamFilter-1.5.0dev-r17344/tracspamfilter/filtersystem.py", line 37, in <module>
    from tracspamfilter.filters.trapfield import TrapFieldFilterStrategy
  File "/builddir/build/BUILD/TracSpamFilter-1.5.0dev-r17344/tracspamfilter/filters/trapfield.py", line 19, in <module>
    from trac.web.api import ITemplateStreamFilter
ImportError: cannot import name ITemplateStreamFilter

Fedora Linux 33 (due for release in October) will have trac 1.5.1 or later so the SpamFilter plugin won't be able to work there as things stand.