Describe the bug
While playing videos, there's a general jerkiness every few seconds.

To Reproduce
Steps to reproduce the behavior:

1. Configure a CPU-optimized Digital Ocean droplet with 8Gb of RAM in your closests datacentre
2. Install Neko as per instructions
3. Log in, go to this trailer, play it, full

Please give us some details about the systems you are using:

• Client (OS name and version): Windows 10, VNCtiger v1.8.80
• Remmina version (remmina --version): 1.2.0-rcgit-27
• Desktop environment (GNOME, Unity, KDE, ..): GNOME 3.18.5
• Connecting to (OS and version): Ubuntu 16.04.4
• Connecting via (RDP, VNC, ...): VNCI

I set Remmina listening on VNC 5901
error log:

Welcome to 

Bug Fix

Fixes #251

Additional info

The value of the slider and input widget are now embedded into the payload.

If in the custom_menu.json file, user defines "payload" as type string for the input/slider widget, the actual payload sent will still be an object where the user defined string is embedded by the tag "string".

Hi,

It is quite stupid to have one type for many events.
Suggestion:
On feature_segment update sends : FLAG_SEGMENT_UPDATED
On feature_identity update sends : FLAG_IDENTITY_UPDATED
on feature update sends : FLAG_FEATURE_UPDATED