Add support for partials and path segments for Handlebars.

This introduces support for some missing features to the Handlebars lexer:
Partials and path segments. Partials mostly appeared to work before, but the
`>` in `{{> ... }}` would appear as a syntax error, as could other
components of the partial. This change introduces support for:

* Standard partials: `{{> partialName}}`
* Partials with parameters: `{{> partialName varname="value"}}`
* Ddynamic partials: `{{> (partialFunc)}}`
* Ddynamic partials with lookups: `{{> (lookup ../path "partialName")}}`
* Partial blocks: `{{> @partial-block}}`
* Inline partials: `{{#*inline}}..{{/inline}}`

It also introduces support for path segments, which can reference content in
the current context or in a parent context. For instance, `this.name`,
`this/name`, `./name`, `../name`, `this/name`, etc. These are all now tracked
as variables.

1 files changed, 8 insertions, 0 deletions

diff --git a/tests/examplefiles/example.f90 b/tests/examplefiles/example.f90
new file mode 100644
index 00000000..40462189
--- /dev/null
+++ b/tests/examplefiles/example.f90
@@ -0,0 +1,8 @@
+program main
+  integer, parameter :: mykind = selected_real_kind()
+  print *, 1
+  print *, 1_mykind
+  print *, 1.
+  print *, 1._mykind
+  print *, (1., 1._mykind)
+end program main