Update .gitignore.

Added a few extensions and ignore paths.

.gitignore

@@ -18,9 +18,10 @@ ipch
 *.opensdf
 *.idb
 *.vcxproj
-*.sln
-*.vpc_crc
-*.filters
+*.vcxproj.filters
+*.sln
+[Dd]ebug*/
+[Rr]elease*/
 
 # OSX/Linux build products
 *.mak
@@ -29,6 +30,7 @@ ipch
 obj*/
 !devtools/*.mak
 !utils/smdlexp/smdlexp.mak
+*_osx32*
 
 # Specific Source build products
 client.pdb
@@ -50,6 +52,12 @@ client.dylib.dSYM/
 server.dylib
 server.dylib.dSYM/
 
+*.vpc.sentinel
+*.vpc_crc
+**/generated_proto/**
+**/src/utils/sapi51/**
+**/game/**/bin/**
+
 # files generated by running a mod
 config.cfg