Add support for special characters in file name

[m1k1o]

Examples what this PR fixes:

• File name containing ' would result to cropped downloaded name, fixed in 6f26be9.
• File name containing # would not be downloaded, because its url was not url encoded, fixed in 6a3e40b.
• File name containing any HTML tag would be rendered, e.g. <b>File</b> or <script>alert('evil');</script>, fixed in a99a51a.
• Folder name consisting of only 0 would fail, fixed in c963b34.
• File name consisting of only 0 would fail, fixed in fb5db75.

Other changes:

• Unified tabs whitespaces in f1f3099.
• Added missing PHP_EOL in 589a6c4.
• Fixes Folder with dot/point inside are seen as file #16 and fixes Problem with folders names containing dots #33 in 95f6bf1.
• Load jQuery only if it is needed in 84849c7.