Use compose-go + improvements (#9)

Use compose-go https://github.com/compose-spec/compose-go  to make Katenary parsing compose file the official way.
Add labels:
- `volume-from` (with `same-pod`) to avoid volume repetition
- `ignore` to ignore a service
- `mapenv` (replaces the `env-to-service`) to map environment to helm variable (as a template string)
- `secret-vars` declares variables as secret values

More:
- Now, environment (as secret vars) are set in values.yaml
- Ingress has got annotations in values.yaml
- Probes (liveness probe) are improved
- fixed code to optimize
- many others fixes about path, bad volume check, refactorisation, tests...

examples/basic/docker-compose.yaml

@@ -1,7 +1,8 @@
 version: "3"
 
+# this example is absolutely not working, it's an example to see how it is converted
+# by Katenary
 services:
-
   webapp:
     image: php:7-apache
     environment:
@@ -12,7 +13,8 @@ services:
       # expose an ingress
       katenary.io/ingress: 80
       # DB_HOST is actually a service name
-      katenary.io/env-to-service: DB_HOST
+      katenary.io/mapenv: |
+        DB_HOST: {{ .Release.Name }}-database
     depends_on:
       - database