WebUI: Specify URI size

In some cases, args_ can't be empty. Specify the number of expected args.

Fix 2023ec043c03 ("WebUI: Check URI of GET and POST requests")
Follow project coding style. Issue #2192.
Accept multiple files at once. Closes #2253
Merge pull request #2302 from buinsky/WebUI2

Accept multiple files at once. Closes #2253
Add texts to the icons on the toolbar

The toolbar follows the system style to display texts associated to
icons. Since no specific text is provided, the text used for the action
associated to the button will be used. This could make some of the
buttons rather big.

Add short texts to the icons so that each button uses a reasonable
amount of space.
Fix qbittorrent-nox daemon.
Merge pull request #2314 from glassez/daemon

Fix qbittorrent-nox daemon (discussed in #2300).
Add a context menu to the toolbar to change the position of the text

Closes #1145.
Merge pull request #2046 from pmzqla/toolbar-menu

Allow minor toolbar customizations
Improve command line parsing.
Merge pull request #2313 from glassez/cmdline

Improve command line parsing.
Merge pull request #2301 from pmzqla/checkuri-fix

WebUI: Specify URI size