Add Colon support

[bastiengrignon]

Adding a new feature to support usage of colon (see new example)

@avishorp this could be interesting to have a new feature to this library

[riraosan]

@bastiengrignon
I like this request. It can be used in my project.
Thanks.

[bastiengrignon]

I'm actually using a modified version of your library for years but didn't think and took the time to make it a new feature for others.

Time has come 😄

[stef-ladefense]

I'm actually using a modified version of your library for years but didn't think and took the time to make it a new feature for others.

Time has come 😄

hi,
have tested your version support dot with your TM1637Colon exemple
don't work correctly
with dot on -> "16:45"
without dot -> "18 45"

correction :
change "writeByte(segments[k] | 0x7f); // Set colon OFF"
by -> "writeByte(segments[k] & ~0x80); // Set colon OFF"
in your "TM1637Display::setSegments" (line 111)

[stef-ladefense]

I'm actually using a modified version of your library for years but didn't think and took the time to make it a new feature for others.

Time has come 😄

see https://github.com/stef-ladefense/TM1637

[avishorp]

In the design of the library, I tried to keep it as stateless as possible (with brightness being the only exception). Your suggestion contradicts this principle. Moreover, setSegments just sends the value to the display, setting the colon on or off is just a matter of setting the right bits, there is no need for a special function to do that.