qmpfw: Quick Mesh Project legacy firmware generator (deprecated)

Adds a new way to generate/store the configuration files for each target:
There are profiles (such as ath-qmp-small-node) which are shared between all similar kind of devices (i.e ubiquiti devices)
And individual configurations (optional) which can be used to specify extra options for the device

Rebuild all remaining config files
Only diffconfig is stored now (not all the config)
Adapt the configs to new bmx6/luci-app-bmx6

Change name tl-wr703 for tl-703n
Rebuild 703n config file