Since the default 10.0.2.0/24 (or 10.0.3.0... etc) address can
conflict with a LAN (as it does in my case), this feature now adds the
ability to set custom network prefixes in the configuration file. I
believe this is an “advanced” usage feature (like port forwarding) and
should not be exposed in the GUI, therefore no GUI changes have been
made.
In the `[Network]` section of 86box.cfg, each of the four NICs can be
set to have a custom address like such:
```
net_01_addr = 10.80.88.0
net_02_addr = 10.82.86.0
net_03_addr = 10.84.86.0
net_04_addr = 10.85.86.0
```
The last octet of the address is effectively ignored and always set to
0 again when the configuration file is saved. Only a /24 CIDR
(netmask 255.255.255.0) is supported. IPv4 has three local-scope
ranges: 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0. Finding a network
prefix within these that do not conflict with your real LAN should not
pose a problem.
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