fix(template-engine): removed gsl, added pyratemp

As GSL failed in my first attempt to get the example program going,
it might be better to try something else before too much time is spend.

Fortunately, pyratemp **seems** to be something usable, and even if not,
it might be possible to make it usable as it's just a 'simple'
python script that I might be able to understand, if need be.

Makefile

@@ -3,30 +3,24 @@
 include Makefile.helpers
 
 PYTHON = python2.7
-CONVERT = $(PYTHON) ./etc/bin/json2xml.py
-GSL = ./etc/bin/gsl_$(OS)-$(ARCH) -q
+TPL = etc/bin/pyratemp.py
 
 API_DEPS = .api.deps
-API_SHARED_XML = ./etc/api/shared.xml
+API_SHARED_INFO = ./etc/api/shared.yml
 API_JSON_FILES = $(shell find ./etc -type f -name '*-api.json')
-API_XML_FILES = $(patsubst %.json,%.xml,$(API_JSON_FILES))
 
 help:
 	$(info Programs)
 	$(info ----> GSL: '$(GSL)')
-	$(info ----> json2xml: '$(CONVERT)')
+	$(info ----> templat engine: '$(TPL)')
 	$(info )
 	$(info Targets)
 	$(info help         -   print this help)
-	$(info json-to-xml  -   convert json API files to xml for consumption by GSL)
 	$(info api-deps     -   generate a file to tell make what API file dependencies will be)
 
 json-to-xml: $(API_XML_FILES)
-$(API_DEPS): $(API_SHARED_XML)
-	$(GSL) -script:src/gsl/deps.gsl $(API_SHARED_XML)
-
-%.xml: %.json
-	$(CONVERT) --pretty -o $@ < $<
+$(API_DEPS): $(API_SHARED_INFO)
+	$(TPL) -f $(API_SHARED_INFO) -d DEP_FILE=$@
 
 api-deps: $(API_DEPS)