Added slice remapper and improved documentation (#8)

* Experimental slice remapper
* Added iter_slices to DiffOp
* Improvements to the utility diff functions
* Documentation improvements
* More documentation updates on utils
* More documentation on main text diff

Cargo.toml

@@ -41,6 +41,10 @@ required-features = ["text"]
 name = "terminal-inline"
 required-features = ["text", "inline", "bytes"]
 
+[[example]]
+name = "original-slices"
+required-features = ["text"]
+
 [[example]]
 name = "udiff"
 required-features = ["text", "bytes"]