Feature: Get info (max and mean) about characters per line

[rubenrua]

More info in https://github.com/XAMPPRocky/tokei/issues/554

[boyter]

Seems like a good thing to add to the wide format.

[boyter]

Useful information

80-characters-per-line limits should be terminal, says Linux kernel chief Linus Torvalds

https://www.theregister.com/2020/06/01/linux_5_7/

-----------------------------------------------------------------------------------------------------
 Language            Files        Lines         Code     Comments       Blanks	   MaxLine   MeanLine
----------------------------------------------------------------------------------------------------
 BASH                    4           49           30           10            9		80    	 12
 JSON                    1         1214         1214            0            0	       320    	 55
 Markdown                4         1236         1236            0            0	      	12    	  4
 Rust                   19         3049         2224          431          394	       180    	 34
 Shell                   1           49           38            1           10	       200    	 44
 TOML                    1           79           68            0           11	      	43    	 16
---------------------------------------------------------------------------------------------------
 Total                  30         5676         4810          442          424	       xxx    	xxx
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