Fix tx repeat number

[jonudewux]

Take in to account protocol specific txrpt value. When learning code should be send then repeat number is higher than default.

[puuu]

Thank you for this contribution.

I see that this is a useful feature and want this feature merged, but the current implementation does not yet satisfy me:

• ESPiLight::createPulseTrain() is a method of the public API and changing their argument list will break other programs, like it broke test_parse.ino and test_proto_limit.ino.
• I do not like pointer references in a C++ style library. (But it seems to be the most efficient way.) If someone has a better approach please tell here.
• please note the file name in your commit message (see other commits, as example)

One possibility would be to provide a default argument for tx_rep, e.g. nullptr and check it before assigning a value.

Would you please update this pull request.

[puuu]

@jonudewux, please have a look to #35, as a alternative implementation.

[puuu]

35 is merged.