* initial dmx setup
* adds support for multiple fixtures, addr gaps, start addresses and all that good DMX stuff
* removes init function. do not need.
* adds some comments, removes others. words.
* added menu entry and dummy HTML
* added server request handler
* cloned options page UI for DMX
* only add code when DMX is enabled
* added infobutton to HTML
* DMX settings form
* procedurally generated HTML form. OBACHT: Values still not coming from the EEPROM.
* upped eeprom version to 15
* changed index for set to 255 to 6 because web interface wants it that way
* gets values for XML from actual settings
* changes the default values for dmx to blanks
* reads and writes DMX settings from EEPROM (2550 - 2569)
* fixes addressing bug in DMX EEPROM read
* saves settings from WebUI to memory
* disables DMX by default
* changed a comment in the ENABLE_DMX line
* makes the display of the DMX entry in settings dependant on WLED_DMX_ENABLE
* adds the server listener for the DMX map
* fixes a bug when selecting 255 for a channel at the dmx settings page
* now actually reads the DMX settings back to the HTML UI.
* cleans up a little
* adds a warning message to the HTML UI when setting up defunct DMX settings
* changed DMX EEPROM addressing to close a gap
* basic DMX map
* fixes a few styling flaws and bugs in the DMX map
* changes config variables to uint16_t
Co-authored-by: Aircoookie <cschwinne@gmail.com>
