linux-v4l2: Selective stream restart

This commit adds a basic check to see if the v4l2 stream requires a
restart. This is primarly implemented on the basis of the fact that
the options requiring a restart have values stored in the v4l2_data
structure. A restart is only needed if any of the values have changed
since the last update.

.gitignore

@@ -27,6 +27,7 @@
 
 #clion
 .idea/
+cmake-build-debug/
 
 #other stuff (windows stuff, qt moc stuff, etc)
 Release_MD/
@@ -39,6 +40,8 @@ GeneratedFiles/
 /UI/obs.rc
 .vscode/
 
+
+
 /other/
 
 #make stuff