Upload Endpoint

Upload Endpoint (#152)

* Upload basics(#117)

* add basic handleMultipleApiActions method and redux store

* finish handle multiple api actions, implement it for delete and upload

* add dropzone lib, improve redux store

* test some file download stuff

* move current folder content to redux store, so we can update it after uploading

* update snapshot

* adust fsEnity model to new refactored model

* basics logic for preflight wip

* add basic components for overwrite merge dialog

* broken stuff

* overwrite / merge / rename basic functional

* selecting all and checking if name is valid

* Yes it is possible to make a 100+ lines method readable, here is how!

* remove debug

* demo deltete

* add second preflight logic

* remove file when they are deleted, fix preflight result parser

* add constant for Filehandler url, map download button

* add basic download functiality

* update tests

* cant fix this test

* fix some bugs with preflight handling

* fix snapshot by removing modal

* handle response for upload

* fix comparion of paths

* remove debug

* ADD_TO_CONTENTS reducer now removes duplicates

* use nginx for hosting and include reverse proxy features (#124)

* use nginx for hosting and include reverse proxy features

* use recomended tagging and updating in dockerfile

* gitignore

* tweak nginx config

* fix proxy pass for fh

* try to fix proxy for fe

* try fe proxy when file does not exist (fallback to index)

* fix proxy redirect to backend

* Integrate Upload fixes (#153)

* fix adding new fsEntities and add currentID

* fix es lint

* fix upload of empty folder and currentFsItemId check

* update test

* remove hardcoded fileIDS

* fix current ID header parsing, design changes

* add action to overwrite/merge all button

* increase client_max_body_size of rest api

* change constants

* requested changes by @open-schnick