Create a Drush command to generate barcodes

This is what it looks like. Please try it out!

$ drush help barcodes:generate
Generates a barcode with the given options.

Examples:
 drush barcodes:generate "Hello World!"                                                Returns markup.                 
 drush barcodes:generate 0xABADCAFE --type=ean13 --height=250 --width=250 --format=png Returns markup.                 
 drush barcodes:generate "Hello World!" --format=png --binary                          Returns binary data for piping. 

Arguments:
 value The string that should be formatted as a barcode. 

Options:
 --type[=TYPE]                     The barcode type. [default: QRCODE]                                                      
 --color[=COLOR]                   The barcode color. [default: #000000]                                                    
 --height[=HEIGHT]                 The barcode height in pixels. [default: 100]                                             
 --width[=WIDTH]                   The barcode width in pixels. [default: 100]                                              
 --padding_top[=PADDING_TOP]       The barcode top padding in pixels.                                                       
 --padding_right[=PADDING_RIGHT]   The barcode right padding in pixels.                                                     
 --padding_bottom[=PADDING_BOTTOM] The barcode bottom padding in pixels.                                                    
 --padding_left[=PADDING_LEFT]     The barcode left padding in pixels.                                                      
 --format[=FORMAT]                 The barcode format. One of: 'svg', 'png', 'htmldiv', 'unicode', 'binary'. [default: png] 
 --binary                          Sends a binary image file to STDOUT (works with --format=png only).                      

Global options:
-v|vv|vvv, --verbose Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug 
-y, --yes            Auto-accept the default for all user prompts. Equivalent to --no-interaction.                      
-l, --uri=URI        A base URL for building links and selecting a multi-site. Defaults to https://default.             
                     To see all global options, run `drush topic` and pick the first choice.                            

Aliases: generate-barcode

And just for fun, let's add a test.

And while I'm at it, a second command (with test):

$ drush help barcodes:formats
Lists the formats that the Barcodes module can output.

Examples:
 drush barcodes:formats                                   A table of formats showing short name (abbreviation) and description. 
 drush barcodes:formats --format=json --fields=short-name Available short names, in JSON format.                                

Options:
 --format=FORMAT Format the result data. Available formats: csv,json,list,null,php,print-r,sections,string,table,tsv,var_dump,var_export,xml,yaml [default: 
                 table]                                                                                                                                     
 --fields=FIELDS Available fields: Abbreviation (short-name), Description (description) [default: short-name description]                                   
 --field=FIELD   Select just one field, and force format to *string*.                                                                                       

Global options:
-v|vv|vvv, --verbose Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug 
-y, --yes            Auto-accept the default for all user prompts. Equivalent to --no-interaction.                      
-l, --uri=URI        A base URL for building links and selecting a multi-site. Defaults to https://default.             
                     To see all global options, run `drush topic` and pick the first choice.                            

Topics:
 drush topic docs:output-formats-filters Output formatters and filters: control the command output 

Aliases: barcodes-formats

Automatically closed - issue fixed for 2 weeks with no activity.