move jquery-datetimepicker to npm/webpack (#10713)

- update to latest version and move to npm
- adapt for api changes and css class rename
- add specificity to arc-green rules as dependency css now loads later
- use imports-loader to make it load correctly
- fix some wrong paths in librejs

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

templates/pwa/serviceworker_js.tmpl

@@ -10,10 +10,10 @@ var urlsToCache = [
   '{{StaticUrlPrefix}}/js/swagger.js?v={{MD5 AppVer}}',
   '{{StaticUrlPrefix}}/js/userheatmap.js',
   '{{StaticUrlPrefix}}/js/dropzone.js',
+  '{{StaticUrlPrefix}}/js/datetimepicker.js',
   '{{StaticUrlPrefix}}/vendor/plugins/codemirror/addon/mode/loadmode.js',
   '{{StaticUrlPrefix}}/vendor/plugins/codemirror/mode/meta.js',
   '{{StaticUrlPrefix}}/vendor/plugins/emojify/emojify.custom.js',
-  '{{StaticUrlPrefix}}/vendor/plugins/jquery.datetimepicker/jquery.datetimepicker.js',
   '{{StaticUrlPrefix}}/vendor/plugins/jquery.minicolors/jquery.minicolors.min.js',
   '{{StaticUrlPrefix}}/vendor/plugins/simplemde/simplemde.min.js',
 
@@ -22,9 +22,9 @@ var urlsToCache = [
   '{{StaticUrlPrefix}}/css/swagger.css?v={{MD5 AppVer}}',
   '{{StaticUrlPrefix}}/css/userheatmap.css',
   '{{StaticUrlPrefix}}/css/dropzone.css',
+  '{{StaticUrlPrefix}}/css/datetimepicker.css',
   '{{StaticUrlPrefix}}/fomantic/semantic.min.css?v={{MD5 AppVer}}',
   '{{StaticUrlPrefix}}/vendor/assets/font-awesome/css/font-awesome.min.css',
-  '{{StaticUrlPrefix}}/vendor/plugins/jquery.datetimepicker/jquery.datetimepicker.css',
   '{{StaticUrlPrefix}}/vendor/plugins/jquery.minicolors/jquery.minicolors.css',
   '{{StaticUrlPrefix}}/vendor/plugins/simplemde/simplemde.min.css',
   '{{StaticUrlPrefix}}/vendor/plugins/tribute/tribute.css',