WIP: working on a full refactor for v2.0

This is still not functional, because it involves a LOT of changes to
the basic structure of the project. Some of the main changes can be seen
in the CHANGELOG.md file, if you're interested, but it boils down to
simplifying the logic of plugins (no more activation/deactivation
shenanigans), more robust typing and use of schemas (pydantic) to
avoid inconsistencies and user errors.

docs/examples/results/example-moral.json

@@ -0,0 +1,42 @@
+{
+  "@context": "http://senpy.gsi.upm.es/api/contexts/YXBpP2FsZ289ZW1",
+  "@id": ":Result1",
+  "@type": "results",
+  "activities": [
+    {
+      "@id": ":MoralAnalysis1_Activity",
+      "@type": "amor:MoralValueAnalysis",
+      "prov:wasAssociatedWith": ":MoralAnalysis1",
+      "amor:usedMoralValueModel": "amor-mft:MoralFoundationsTheory",
+      "amor:analysed": "news1",
+      "amor:usedMLModel": ":model1",
+      "prov:generated": ":annotation3"
+    }
+  ],
+  "entries": [
+    {
+      "@id": "http://micro.blog/status1",
+      "@type": [
+        "nif:RFC5147String",
+        "nif:Context"
+      ],
+      "nif:isString": "Dear Microsoft, put your Windows Phone on your newest #open technology program. You'll be awesome. #opensource",
+      "morality": [
+        {
+          "@id": ":annotation3",
+	  "@type": "amor:MoralValueAnnotation",
+	  "nif:beginIndex": 80,
+          "nif:endIndex": 97,
+	  "amor:hasMoralValueCategory": "mft:Authority",
+	  "amor:confidence": 0.75,
+	  "amor-mft:hasPolarityIntensity": 0.2,
+	  "amor:annotated": "http://micro.blog/status1",
+          "nif:anchorOf": "You'll be awesome.",
+          "prov:wasGeneratedBy": ":MoralAnalysis1_Activity"
+        }
+      ],
+      "emotions": [
+      ]
+    }
+  ]
+}