[READY] Moved change tracking to python. Per buffer diagnostics
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Adds an emulation of Vim buffer object and moves change tracking into python.
Now diagnostics are stored per buffer, which effectively solves #2165 .
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[READY] Fix diagnostic highlighting with invalid location extent
ycmd may return a location extent with a starting column of zero (see the test for an example) which is not a valid column (columns are 1-indexed). We should use the location in this case. Also, when the location extent is not valid, we should call `AddDiagnosticSyntaxMatch` with the `is_error` parameter to highlight warnings as such and not as errors (`is_error` is `True` by default).
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On non-Windows platforms, a ConnectionError exception is raised instead
of a ConnectTimeout one when the connection cannot be established (e.g.
the server crashed). Since the latter is a subclass of the former, we
only need to catch ConnectionError.
Sitecustomize files can be slow or broken and might hang editor
startup. Since they aren't necessary for checking the python version,
disable them to get a small speed boost for everyone, and an editor
that doesn't hang indefinitely on startup if the sitecustomize gets
into an infinite loop (due to a bad NFS mount or similar).
[READY] Fix exception when response future is not set
An `AttributeError` exception is raised when `Done` is called before `Start` in the `CompletionRequest` and `EventNotification` classes because the `_response_future` attribute is not yet defined.
Fixes#2461.
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[READY] Fix flake8 error
This fixes a new error detected by the last version of `pycodestyle` (2.2.0), which is a dependency of `flake8`:
```
C:\projects\youcompleteme\python\ycm\youcompleteme.py:69:1: E305 expected 2 blank lines after class or function definition, found 1
```
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