[BUGFIX] Resource storage does not emit signals

The ResourceStorage class should emit signals before and after most
actions it performs. The emit*() methods are already there, but not
called from the "action" methods. This commit adds the calls where
missing.

Change-Id: Icf1653975aa72762ab61c6d649207c5900e66b1d
Resolves: #46587
Releases: 6.1, 6.0
Reviewed-on: https://review.typo3.org/19221
Reviewed-by: Alexander Opitz
Reviewed-by: Wouter Wolters
Reviewed-by: Tom Ruether
Reviewed-by: Benjamin Mack
Tested-by: Benjamin Mack
[FEATURE] Add delete button in file list

Currently it is not possible to delete a file or folder
in the file list. Additionally, there is translation and
error handling missing. The patch adds the trash
icon to the file list (if the user has the right) and
adds error and success messages.

Releases: 6.1, 6.0
Resolves: #44288
Change-Id: I0f5be642054819a4f01c5e70590e1da455b92af6
Reviewed-on: https://review.typo3.org/19155
Reviewed-by: Benjamin Mack
Tested-by: Benjamin Mack