[CI/CD] Add Travis windows build

* Added APPDATA to tox passenv so it is available to common module.
* Fixed windows path issue in httpdownloader tests
* Skipped torrentmanager test due to the following error from loading a
Linux pickled state file with a different line ending.
    ModuleNotFoundError: No module named 'deluge.core.torrentmanager\r'
* Removed appveyor build

1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 41ff1fbc0..5b9152978 100644
--- a/tox.ini
+++ b/tox.ini
@@ -56,7 +56,7 @@ deps =
 
 [testenv]
 install_command = python -m pip install --ignore-installed {opts} {packages}
-passenv = DISPLAY PYTHONPATH
+passenv = DISPLAY PYTHONPATH APPDATA
 setenv =
     PYTHONPATH = {toxinidir}
     PYTEST_ADDOPTS = --verbose --capture=no