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/base/footer.tmpl

@@ -26,9 +26,6 @@
 {{if .RequireMinicolors}}
 	<script src="{{StaticUrlPrefix}}/vendor/plugins/jquery.minicolors/jquery.minicolors.min.js"></script>
 {{end}}
-{{if .RequireDatetimepicker}}
-	<script src="{{StaticUrlPrefix}}/vendor/plugins/jquery.datetimepicker/jquery.datetimepicker.js"></script>
-{{end}}
 {{if .RequireU2F}}
 	<script src="{{StaticUrlPrefix}}/vendor/plugins/u2f/index.js"></script>
 {{end}}

templates/base/head.tmpl

@@ -87,7 +87,6 @@
 			AppSubUrl: '{{AppSubUrl}}',
 			StaticUrlPrefix: '{{StaticUrlPrefix}}',
 			csrf: '{{.CsrfToken}}',
-			Datetimepicker: {{if .RequireDatetimepicker}}true{{else}}false{{end}},
 			HighlightJS: {{if .RequireHighlightJS}}true{{else}}false{{end}},
 			Minicolors: {{if .RequireMinicolors}}true{{else}}false{{end}},
 			SimpleMDE: {{if .RequireSimpleMDE}}true{{else}}false{{end}},
@@ -120,9 +119,6 @@
 	</noscript>
 {{if .RequireMinicolors}}
 	<link rel="stylesheet" href="{{StaticUrlPrefix}}/vendor/plugins/jquery.minicolors/jquery.minicolors.css">
-{{end}}
-{{if .RequireDatetimepicker}}
-	<link rel="stylesheet" href="{{StaticUrlPrefix}}/vendor/plugins/jquery.datetimepicker/jquery.datetimepicker.css">
 {{end}}
 	<style class="list-search-style"></style>
 {{if .PageIsUserProfile}}