Move templates outside the source .mk filestemplates

Templates now no longer use Make variables for substitution
but instead replace strings with their equivalent:

  template_name: Corresponds to n=template_name
  project_name:  Corresponds to $(PROJECT) or in=project_name

This allows defining templates outside of Makefiles. For
example an external plugin could define their templates
in templates/my_template.erl and then have the following
in the included Makefile:

  tpl_my_template = $(file < $(THIS)/templates/my_template.erl)

By default the created file will be in src/template_name.erl.
This can be overriden with the tplp_* variable:

  tplp_my_template = src/model/my_template.erl

Substitution is applied both to the template contents and
to its path.

In addition, attempting to overwrite an existing file when
creating a template will result in failure.

1 files changed, 13 insertions, 0 deletions

diff --git a/templates/application.app.src b/templates/application.app.src
new file mode 100644
index 0000000..3bd1d6b
--- /dev/null
+++ b/templates/application.app.src
@@ -0,0 +1,13 @@
+{application, project_name, [
+	{description, ""},
+	{vsn, "0.1.0"},
+	{id, "git"},
+	{modules, []},
+	{registered, []},
+	{applications, [
+		kernel,
+		stdlib
+	]},
+	{mod, {project_name_app, []}},
+	{env, []}
+]}.