More Find in Files improvements

[ccordoba12]

I used the new Find in Files after PR #4056 was merged, and these are my suggestions to improve your previous work @andfoy (which, by the way, was great!):

1. Results must be shown in ascending order, i.e. first line 1, then line 3, etc. Right now results are shown in descending order (please take a look at the screenshot).

2. We need to remove information about columns. For example, in the screenshot you can see two results about line 1 (one for column 5, the other for column 0). We simply need to report one entry per line (as it's done in ack or ag).

3. The name of the file must be in bold. Example (from the screenshot):

   spam.txt - /home/carlos/Projects/...
   -> ...

4. The line number must in bold too, the text inside the line must use a monospaced font, and the results detected inside it must be in bold too. Example (from the screenshot):

   3: lore ipsum sit dolorspam

5. After a file is completely searched, its results need to be expanded automatically. This avoids the need of pressing the expand button every time you search for something (which becomes tiresome :-).

6. Icons for file types need to be changed to use file-o from FontAwesome:

   https://github.com/spyder-ide/spyder/blob/master/spyder/utils/icon_manager.py#L175

[andfoy]

With respect to the column information, I decided to display all the results independently, because sometimes a search match can be found on files that contain a single text line, such as minified Javascript sources. On such cases, displaying the match elements may be more difficult if the result is shown on a single line

[goanpeca]

We need to remove information about columns. For example, in the screenshot you can see two results about line 1 (one for column 5, the other for column 0). We simply need to report one entry per line (as it's done in ack or ag).

Yeah, I agree with @andfoy, I am not convinced with removing the column info.