Update gitignore

.gitignore

@@ -1,12 +1,25 @@
+# First, ignore everything
 *
-
-## Except
+# Now, whitelist anything that's a directory
+!*/
+# And all the file types you're interested in
+!.gitignore
+!.githooks/post-merge
 !**/.gitignore
 !**/.githooks/post-merge
-!/etc/*.ini
-!/etc/atb/*.ini
-!/etc/psa_config/*
-!/etc/psa_update/*
-!/etc/psa_tariff/*
-!/etc/dc/dc2c.hex
+
+## Except
+!etc/atb/*
+!etc/psa_config/*
+!etc/psa_update/*
+!etc/psa_tariff/*
+!etc/dc/*.hex
+!etc/dc/*.bin
+!*/etc/*.ini
+!*/etc/atb/*
+!*/etc/psa_config/*
+!*/etc/psa_update/*
+!*/etc/psa_tariff/*
+!*/etc/dc/*.hex
+!*/etc/dc/*.bin