v3 root file cleanup (#190)

* Enc file removed

* Removes gitpod file

* Removes mac jenv java-version file

* Removes visual studio code workspace file

* Removes shippable file

* Removes vagrant

* Removes maven binary and files

* Adds spotbugs back in

* Moved docker entrypoint file

* Moves docker-entrypoint

* Updates readme, moves run_in_docker to bin

* Fixes path in new.sh options creation

* Adjusts new.sh command contents to point to right paths

* Moves new.sh to bin/new_generator.sh

* Fixes filename

* Adds missing optionin options provider test

* Moves code of conduct into docs

* Moves constributing md file into docs

* Fixes python java tests, refactors template engine setting

* Fixes java test

* Fixes PR template

* Excludes venv in java test resources, turns sys out println into logger info

* Fixes testResource exclusion

Author: spacether

.github/PULL_REQUEST_TEMPLATE.md

@@ -3,11 +3,11 @@
 <!-- Please check the completed items below -->
 ### PR checklist
 
-- [ ] Read the [contribution guidelines](https://github.com/openapi-json-schema-tools/openapi-json-schema-generator/blob/master/CONTRIBUTING.md).
+- [ ] Read the [contribution guidelines](https://github.com/openapi-json-schema-tools/openapi-json-schema-generator/blob/master/docs/contributing.md).
 - [ ] Pull Request title clearly describes the work in the pull request and Pull Request description provides details about how to validate the work. Missing information here may result in delayed response from the community.
 - [ ] Run the following to [build the project](https://github.com/OpenAPITools/openapi-json-schema-generator#14---build-projects) and update samples:
   ```
-  ./mvnw clean package 
+  mvn clean package 
   ./bin/generate-samples.sh
   ./bin/utils/export_docs_generators.sh
   ``` 

.gitignore

@@ -27,7 +27,6 @@ atlassian-ide-plugin.xml
 packages/
 .pub
 .packages
-.vagrant/
 .vscode/
 **/.vs
 .factorypath