Add an "Identify" File Operation

[zelon88]

After "Download" but before "Delete" there should be an "Information" icon that opens a panel displaying information about the file.

We can use basic information like file size, but also format specific data where available.

As far as core logic is concerned;

• This will require an identifyFile() function & associated code to call it in convertCore.php.
• We might want to break identifyFile() down further with an identify() function and structure similar to how convertFiles() & convert() functions are done. This will make it more consistent and easier to follow different logic for different formats.
• We can call identifyFile() automatically for every file that is uploaded and pre-populate the information field.
• Or we can use Ajax similar to what is done with the entire shareFile() process to gather this information only as needed.
• I think pre-fetching this information for every uploaded file is problably the best way to go.