Split PVKII into its own engine branch (#1847)

* 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

tools/checkout-deps.ps1

@@ -28,7 +28,8 @@ param(
         'bgt',
         'eye',
         'contagion',
-        'doi'
+        'doi',
+        'pvkii'
         )
 )
 

tools/checkout-deps.sh

@@ -126,7 +126,7 @@ if [ -z ${sdks+x} ]; then
 
   if [ $ismac -eq 0 ]; then
     # Add these SDKs for Windows or Linux
-    sdks+=( orangebox blade episode1 bms )
+    sdks+=( orangebox blade episode1 bms pvkii )
 
     # Add more SDKs for Windows only
     if [ $iswin -eq 1 ]; then