Add binary files to gitignore (#376)

## Type of change
```
- [ ] Bug fix
- [ ] New feature development
- [x] Tech debt (refactoring, code cleanup, dependency upgrades, etc)
- [ ] Build/deploy pipeline (DevOps)
- [ ] Other
```

## Objective
These files have to be copied in specific places when building the SDK
bindings, and having them tracked by git is quite annoying.

.gitignore

@@ -15,6 +15,13 @@ bld/
 [Bb]in/
 [Oo]bj/
 
+# Binary files
+*.dylib
+*.a
+*.so
+*.dll
+*.class
+
 # Editor directories and files
 .idea
 xcuserdata/