Create new default channel configurations.

[mc-hamster]

We currently have:

Short Name	Long Name		SF	bytes / sec	bits / sec
LongSlow	Very long range (but slow)	Bw125Cr48Sf4096	12	17.09	136.71
LongAlt	Long range (but slower)	Bw31_25Cr48Sf512	9	24.59	196.74
Medium	Medium range (but fast)	Bw125Cr45Sf128	7	600.00	4800.00
ShortFast	Short range (but fast)	Bw500Cr45Sf128	7	2418.37	19346.94

Naming is inconsistent and it leaves a large gap of performance between LongAlt and Medium.

Create two new intermediate configurations. Proposed:

Short Name	Long Name			bytes / sec	bits / sec
LongSlow	Long Range / Slow	Bw125Cr48Sf4096	12	17.09	136.71
LongFast	Long Range / Fast	Bw31_25Cr48Sf512	9	24.59	196.74
MediumSlow*	Medium Range / Slow	Bw250Cr46Sf2048	11		895*
MediumFast*	Medium Range / Fast	Bw250Cr47Sf1024	10		1400*
ShortSlow	Short Range / Slow	Bw125Cr45Sf128	7	600.00	4800.00
ShortFast	Short Range / Fast	Bw500Cr45Sf128	7	2418.37	19346.94

The channel names will renamed but the enum positions and values will remain the same for backward compatibility. Data rates are estimates and will be confirmed once implemented.

This will be generally required by the S&F plugin due to the bandwidth requirements to replay a few hundred messages.

[mc-hamster]

This is done on Device and Python.