Add generic TODO snippet using commentstring

UltiSnips/c.snippets

@@ -155,26 +155,6 @@ int main(int argc, char **argv) {
 }
 endsnippet
 
-# TODO: Should this be in all.snippets?
-# 1. Take the form '<comment> TODO: issue ${1:id} $0'
-snippet todo "Todo comment"
-// TODO$1: $0
-endsnippet
-
-# TODO: Should this be in all.snippets?
-# 1. Take the form '<comment> NOTE: issue ${1:id} $0'
-snippet note "Note comment"
-// NOTE$1: $0
-endsnippet
-
-snippet in "Doxygen [in]" i
-[in]
-endsnippet
-
-snippet out "Doxygen [out]" i
-[out]
-endsnippet
-
 snippet @param "Doxygen param tag"
 @param[$1`!p snip.rv = complete(t[1], ['in', 'out'])`]
 endsnippet