chore(docs): change the directory of generated docs to documentation
improve(BaseClass): move base class in seperate file
feat(): work on camunda form

chore(processdefinition): add method to load form

chore(form): start form of process
improve(variableManager): use Object.keys to retrieve variable names
fix(mock): correct randomString usage
docs(controls): add some docs about SDK
feat(form): add choices field handling