More changes to uploads:

- Have got upload images appearing in the post list
- Allowed for deleting uploads
- Allowed for seeing the upload progress
- Fixed the setting of upload properties like the MIME type
- Removed the stripe exif logic with just re-encoding PNGs and JPEGs by loading them and saving them

assets/css/main.scss

@@ -24,4 +24,20 @@ $container-max-widths: (
 
 .post-form textarea {
     height: 100%;
+}
+
+.postlist .post img {
+    max-width: 300px;
+    height: auto;
+    max-height: 300px;
+}
+
+.show-upload figure img {
+    max-width: 100vw;
+    height: auto;
+    max-height: 70vh;
+}
+
+.upload-progressbar {
+    width: 150px;
 }