* Update MM:S version in CI, dependency checkout scripts and sample extensions
* Update MM:S version in CI, dependency checkout scripts and sample extensions
* Fix EOL problems
* Initial PVKII branch support
* Change PVKII code to 23, DOTA uses 22 in MM
* Bunch more SE_PVKII preprocessor that was missed
* Add some missing SOURCE_ENGINE_PVKII cases
* Update PVKII FireOutput signature for Linux
* Update checkout-deps with 'pvkii'
* Fix FireOutput signature for PVKII, accidentally used one from newer build
* Change PVKII code to 10, and bump others by 1
* Only check against SE_SDK2013 here, like Metamod
* More SE_PVKII preprocessor cleanup
* Prefer python3 over python(2) in checkout-deps
We require Python 3 and don't want to accidentally use Python 2 if both are available.
* Use python3 in travis build
* Install python3-pip package on travis trusty image
* Fix pip detection in checkout-deps.sh
.sh version has this bit:
```
if [ $ismac -eq 0 ]; then
# Add these SDKs for Windows or Linux
sdks+=( orangebox blade episode1 bms )
# Add more SDKs for Windows only
if [ $iswin -eq 1 ]; then
sdks+=( darkm swarm bgt eye contagion )
fi
fi
```
Added these to the SDK list.
