Nigao/newtemplate (#323)

* a few changes

(1) fix the cancel.lu bug
(2) add datetime.lu
(2) stringSetdatetime.dialog.lg

* autohelp for new templates

* add $requires, and datetime entity sets

* add all stringSet for prebuilt entities explicitly

* change prebuilt-entity.lu.lg files

Author: ninggao

packages/dialog/templates/en-us/age.lu

@@ -0,0 +1,7 @@
+# filename
+- @{entityFilename()}
+
+# template
+- $PREBUILT:age @{roles()}
+
+[generator.lg](../generator.lg)

packages/dialog/templates/en-us/age.lu.lg

@@ -0,0 +1,7 @@
+# filename
+- @{entityFilename()}
+
+# template
+- $PREBUILT:currency @{roles()}
+
+[generator.lg](../generator.lg)

packages/dialog/templates/en-us/currency.lu

@@ -0,0 +1,7 @@
+# filename
+- @{entityFilename()}
+
+# template
+- $PREBUILT:datetime @{roles()}
+
+[generator.lg](../generator.lg)

packages/dialog/templates/en-us/currency.lu.lg

@@ -0,0 +1,7 @@
+# filename
+- @{entityFilename()}
+
+# template
+- $PREBUILT:datetimeV2 @{roles()}
+
+[generator.lg](../generator.lg)

packages/dialog/templates/en-us/datetime.lu

@@ -0,0 +1,7 @@
+# filename
+- @{entityFilename()}
+
+# template
+- $PREBUILT:dimension @{roles()}
+
+[generator.lg](../generator.lg)