Remmina v1.4.25 release

Just a quick bugs fixing release.

• kiosk: Drop GNOME MediaKeys plugin !2377 @jbicha
• Honour soft links target in SFTP !2379 @antenore
• Optional close confirmation !2380 @antenore
• Fix some build warnings !2382 @donoban
• Fix manpages !2378 @Fantu
• Snap cleanup + kwallet support !2381 @antenore
• Deprecations and amend g_date_time_format_iso8601 !2383 @antenore
• Fixes to snap build !2384 @giox069
• Removing dependencies that are available as extensions !2385 @antenore
• FreeRDP_OffscreenSupportLevel is of type UINT32 !2386 @akallabeth
• Minor fixes !2387 @antenore
• Get the right value for FreeRDP_AutoReconnectMaxRetries !2388 @antenore