Refactor PluginsLoader into separate components

styles/DataDirPicker.module.css

@@ -0,0 +1,3 @@
+.no-top-margin {
+  margin-top: 0;
+}

styles/PluginList.module.css

@@ -1,7 +1,3 @@
-.no-top-margin {
-  margin-top: 0;
-}
-
 .plugin-list {
   list-style-type: none;
   padding: 0;
@@ -22,7 +18,7 @@
 }
 
 /* From: https://stackoverflow.com/a/28074607/6620612 */
-.processing:after {
+.loading:after {
   overflow: hidden;
   display: inline-block;
   vertical-align: bottom;
@@ -43,35 +39,3 @@
     width: 1.25em;
   }
 }
-
-.plugins-txt-dialog {
-  top: 12px;
-  z-index: 4;
-  background-color: #fbefd5;
-  box-shadow: 0 0 1em black;
-  max-width: 400px;
-}
-
-.plugins-txt-dialog h3 {
-  margin-top: 0px;
-}
-
-.plugins-txt-dialog textarea {
-  width: 100%;
-  min-height: 100px;
-  resize: vertical;
-}
-
-.plugins-txt-dialog menu {
-  padding: 0;
-  display: flex;
-  justify-content: space-between;
-}
-
-.drop-area {
-  position: absolute;
-  top: 0px;
-  left: 0px;
-  width: 100%;
-  height: 100%;
-}

styles/PluginTxtEditor.module.css

@@ -0,0 +1,31 @@
+.dialog {
+  top: 12px;
+  z-index: 4;
+  background-color: #fbefd5;
+  box-shadow: 0 0 1em black;
+  max-width: 400px;
+}
+
+.dialog h3 {
+  margin-top: 0px;
+}
+
+.dialog textarea {
+  width: 100%;
+  min-height: 100px;
+  resize: vertical;
+}
+
+.dialog menu {
+  padding: 0;
+  display: flex;
+  justify-content: space-between;
+}
+
+.drop-area {
+  position: absolute;
+  top: 0px;
+  left: 0px;
+  width: 100%;
+  height: 100%;
+}