move vue and vue-calendar-heatmap to webpack (#10188)

- unvendor vue and vue-calendar-heatmap
- remove unused moment.js leftover from previous heatmap version
- ensure webpack loads the full version of vue
- fix vue devmode warning related to 'searchLimit' type

I wanted to name the chunk heatmap.js but adblockers don't like that
filename [1].

[1] 3899d5dff3/easyprivacy/easyprivacy_general.txt (L2095)

templates/base/footer.tmpl

@@ -108,16 +108,8 @@
 	</script>
 {{end}}
 	<script src="{{StaticUrlPrefix}}/vendor/plugins/emojify/emojify.custom.js"></script>
-	<script src="{{StaticUrlPrefix}}/vendor/plugins/vue/vue.min.js"></script>
 	<script src="{{StaticUrlPrefix}}/fomantic/semantic.min.js?v={{MD5 AppVer}}"></script>
 	<script src="{{StaticUrlPrefix}}/js/index.js?v={{MD5 AppVer}}"></script>
-{{if .EnableHeatmap}}
-	<script src="{{StaticUrlPrefix}}/vendor/plugins/moment/moment.min.js" charset="utf-8"></script>
-	<script src="{{StaticUrlPrefix}}/vendor/plugins/vue-calendar-heatmap/vue-calendar-heatmap.browser.js" charset="utf-8"></script>
-	<script type="text/javascript">
-		window.initHeatmap('user-heatmap', '{{.HeatmapUser}}');
-	</script>
-{{end}}
 {{template "custom/footer" .}}
 </body>
 </html>

templates/base/head.tmpl

@@ -93,6 +93,8 @@
 			SimpleMDE: {{if .RequireSimpleMDE}}true{{else}}false{{end}},
 			Tribute: {{if .RequireTribute}}true{{else}}false{{end}},
 			U2F: {{if .RequireU2F}}true{{else}}false{{end}},
+			Heatmap: {{if .EnableHeatmap}}true{{else}}false{{end}},
+			heatmapUser: {{if .HeatmapUser}}'{{.HeatmapUser}}'{{else}}null{{end}},
 		};
 	</script>
 	<link rel="shortcut icon" href="{{StaticUrlPrefix}}/img/favicon.png">
@@ -124,9 +126,6 @@
 {{end}}
 {{if .RequireDropzone}}
 	<link rel="stylesheet" href="{{StaticUrlPrefix}}/vendor/plugins/dropzone/dropzone.css">
-{{end}}
-{{if .EnableHeatmap}}
-	<link rel="stylesheet" href="{{StaticUrlPrefix}}/vendor/plugins/vue-calendar-heatmap/vue-calendar-heatmap.css">
 {{end}}
 	<style class="list-search-style"></style>
 {{if .PageIsUserProfile}}