Refactoring, more tests, lint fixes, optimise

* Refactoring, more tests, lint fixes, optimise
* Lint CI fixes
* Changing version, readme help fixes
* Validation rule, validation tests, minor improvements

.github/workflows/lint_test.yml

@@ -1,4 +1,4 @@
-name: Run linters and unittests
+name: Lint and Test
 
 on:
   push:
@@ -30,19 +30,18 @@ jobs:
     - name: Analysing the code with pylint
       run: |
         pylint \
-        *.py \
+        ./sgpt \
+        ./tests \
+        --disable=fixme \
+        --disable=cyclic-import \
+        --disable=useless-import-alias \
         --disable=missing-function-docstring \
-        --disable=too-many-arguments \
         --disable=missing-module-docstring \
-        --disable=import-error \
         --disable=missing-class-docstring \
-        --disable=too-many-instance-attributes \
         --disable=too-many-function-args \
-        --disable=unspecified-encoding \
-        --max-line-length=120
+
     - name: Analysing the code with black
-      run: |
-        black --target-version py310 -l 120 *.py
+      run: black ./sgpt ./tests --check --target-version py310
     - name: Run unittests
       run: |
         export OPENAI_API_KEY=test_api_key