Support for the default ramp rate setting for Dimmer and KeypadLinc

[jordanrounds]

This adds support for setting the ramp rate using the set_flags command. It supports a value between 0 and 31. I've tested locally on real hardware and setting the rate works without any issue. The changes I've made are basically a duplicate of the set_on_level method.

[tstabrawa]

Closes #207

[krkeegan]

I note that this will only work with i2 or i2cs devices. There is a way to do this for i1 devices, but I am starting to question whether we want to continue adding features for such devices. They are very old now and often cause a lot of issues. It is hard to test the code as most developers do not have these devices.

I would be content to start a type of "deprecation" of i1 devices. We have the basic functionality for supporting them, I am not suggesting removing that. But I would be fine with not adding support for additional features unless an owner of i1 devices wants to step forward and write the code.

I had one comment about checking to see if the KPL is a dimmer. If we address that, then I see no reason not to merge this.

[tstabrawa]

Sorry for the late comment. I noticed that this code is expecting a ramp rate value that would be handed directly to the device -- so the user would be expected to know what value to use based on how those values are interpreted by devices (such as by consulting this table.)

I just wanted to raise the question - would it be better if the ramp rate were specified in seconds, and translated using the Dimmer.ramp_pretty lookup table, similar to as done in link_data_from_pretty()? (Same question applies to the changes to the Dimmer class.)

This might be a question for @krkeegan or @TD22057 to answer, though.

[krkeegan]

Ahh, yes good catch, that is a better way to handle things. The code is already available. Look inside Devices/Dimmer you should see a dict of ramp_pretty. Something like the following code should handle the conversion for you:

data_3 = 0x1f
for ramp_key, ramp_value in self.ramp_pretty.items():
    if rate >= ramp_value:
        data_3 = ramp_key
        break

Then set your D3 value using data_3. That code will select the exact ramp rate if it exists or the next lowest valid value.

[jordanrounds]

Made the changes you suggested. Needed to add to the util to support float. Not exactly sure I handled everything necessary or am following the patterns elsewhere in the code, but that seemed like where I was supposed to be doing it.

[krkeegan]

Bah, this was merged into master. That was my fault, I should have looked more carefully. I am quickly resetting master before anyone else syncs to it.

I will rebase it off of dev and resubmit it for you Jordan. In the future, please create your branch off of dev.

[jordanrounds]

Sorry about that. This is my first time contributing anything. I'll create the branch off of dev next time.

[krkeegan]

No problem, it happens a lot, I should have caught it. All fixed by #253 now.