remote-control

Describe the bug you encountered:

Mac 客户端启动后一闪一闪的，鼠标动一下就闪一下，不动就是白板。

What did you expect to happen instead?

MAC 系统版本：
![image](https://user-images.githubusercontent.com/10514424/123781011-568c5280-d906-11eb-8e59-cf

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 

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