Add explicit "# key" directive to legacy snippet collection before deprecating filenames-as-triggers

snippets/csharp-mode/attrib

@@ -1,5 +1,6 @@
 #contributor : Alejandro Espinoza Esparza <aespinoza@structum.com.mx>
 #name : private attribute ....;
+# key: attrib
 # --
 /// <summary>
 /// $3

snippets/csharp-mode/attrib.1

@@ -1,5 +1,6 @@
 #contributor : Alejandro Espinoza Esparza <aespinoza@structum.com.mx>
 #name : private attribute ....; public property ... ... { ... }
+# key: attrib
 # --
 /// <summary>
 /// $3

snippets/csharp-mode/attrib.2

@@ -1,5 +1,6 @@
 #contributor : Alejandro Espinoza Esparza <aespinoza@structum.com.mx>
 #name : private _attribute ....; public Property ... ... { ... }
+# key: attrib
 # --
 /// <summary>
 /// $3

snippets/csharp-mode/class

@@ -1,5 +1,6 @@
 #contributor : Alejandro Espinoza Esparza <aespinoza@structum.com.mx>
 #name : class ... { ... }
+# key: class
 # --
 ${5:public} class ${1:Name}
 {

snippets/csharp-mode/comment

@@ -1,5 +1,6 @@
 #contributor : Alejandro Espinoza Esparza <aespinoza@structum.com.mx>
 #name : /// <summary> ... </summary>
+# key: comment
 # --
 /// <summary>
 /// $1

snippets/csharp-mode/comment.1

@@ -1,4 +1,5 @@
 #contributor : Alejandro Espinoza Esparza <aespinoza@structum.com.mx>
 #name : /// <param name="..."> ... </param>
+# key: comment
 # --
 /// <param name="$1">$2</param>

snippets/csharp-mode/comment.2

@@ -1,4 +1,5 @@
 #contributor : Alejandro Espinoza Esparza <aespinoza@structum.com.mx>
 #name : /// <param name="..."> ... </param>
+# key: comment
 # --
 /// <returns>$1</returns>

snippets/csharp-mode/comment.3

@@ -1,4 +1,5 @@
 #contributor : Alejandro Espinoza Esparza <aespinoza@structum.com.mx>
 #name : /// <exception cref="..."> ... </exception>
+# key: comment
 # --
 /// <exception cref="$1">$2</exception>

snippets/csharp-mode/method

@@ -1,5 +1,6 @@
 #contributor : Alejandro Espinoza Esparza <aespinoza@structum.com.mx>
 #name : public void Method { ... }
+# key: method
 # --
 /// <summary>
 /// ${5:Description}

snippets/csharp-mode/namespace

@@ -1,5 +1,6 @@
 #contributor : Alejandro Espinoza Esparza <aespinoza@structum.com.mx>
 #name : namespace .. { ... }
+# key: namespace
 # --
 namespace $1
 {

snippets/csharp-mode/prop

@@ -1,5 +1,6 @@
 #contributor : Alejandro Espinoza Esparza <aespinoza@structum.com.mx>
 #name : property ... ... { ... }
+# key: prop
 # --
 /// <summary>
 /// $5

snippets/csharp-mode/region

@@ -1,5 +1,6 @@
 #contributor : Alejandro Espinoza Esparza <aespinoza@structum.com.mx>
 #name : #region ... #endregion
+# key: region
 # --
 #region $1
 $0

snippets/csharp-mode/using

@@ -1,4 +1,5 @@
 #contributor : Alejandro Espinoza Esparza <aespinoza@structum.com.mx>
 #name : using ...;
+# key: using
 # --
 using $1;

snippets/csharp-mode/using.1

@@ -1,4 +1,5 @@
 #contributor : Alejandro Espinoza Esparza <aespinoza@structum.com.mx>
 #name : using System;
+# key: using
 # --
 using System;

snippets/csharp-mode/using.2

@@ -1,4 +1,5 @@
 #contributor : Alejandro Espinoza Esparza <aespinoza@structum.com.mx>
 #name : using System....;
+# key: using
 # --
 using System.$1;