Add support for X PixMap an X BitMap "image" files

References: github-linguist/linguist#4133

See also:
* https://en.wikipedia.org/wiki/X_BitMap
* https://en.wikipedia.org/wiki/X_PixMap

CHANGELOG.md

@@ -9,7 +9,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 [Unpublished]
 ----------------------
 ### Added
-- **Support** Esoteric JavaScript extensions (`.htc`, `.jscript`, `.jse`, `.jslib`, `.jspre`, `.pac`, `.pjs`, `.snap`)
+- **Support** C (`.xbm`, `.xpm`), Esoteric JavaScript extensions (`.htc`, `.jscript`, `.jse`, `.jslib`, `.jspre`, `.pac`, `.pjs`, `.snap`)
 - [[`#734`][]]: Test-icons to test-files that end with `.test` or `.spec` before the file extension. Previously, this effect was limited to `.test.js` files located inside a `specs` or `tests` directory.
 
 [`#734`]: https://github.com/file-icons/atom/issues/734

config.cson

@@ -702,7 +702,8 @@ fileIcons:
 			[".w", "medium-maroon"]
 			[".nc", "dark-blue"]
 			[".upc", "medium-cyan"]
-			[".xpm", "medium-green"]
+			[".xbm", "medium-orange", alias: "X BitMap"]
+			[".xpm", "medium-green", alias: "X PixMap"]
 		]
 
 	"C++":

lib/icons/.icondb.js

@@ -345,6 +345,7 @@ module.exports = [
 ["c-icon",["medium-maroon","medium-maroon"],/\.w$/i],
 ["c-icon",["dark-blue","dark-blue"],/\.nc$/i],
 ["c-icon",["medium-cyan","medium-cyan"],/\.upc$/i],
+["c-icon",["medium-orange","medium-orange"],/\.xbm$/i],
 ["csharp-icon",["medium-blue","dark-blue"],/\.cs$/i,,false,,/\.cs$/i,/^C#$|^c\s*sharp$/i],
 ["csscript-icon",["dark-green","dark-green"],/\.csx$/i,,false,,/\.csx$/i,/^C#[\W_ \t]?Script$/i],
 ["cpp-icon",["medium-blue","dark-blue"],/\.c[+px]{2}$|\.cc$/i,,false,,/\.cpp$/i,/^C\+?\+?$|c[-_]?pp|cplusplus/i],
@@ -1405,5 +1406,5 @@ module.exports = [
 ["book-icon",["dark-blue","dark-blue"],/^news(?:[-_.]?[-\d]+)?$/i,0],
 ["key-icon",["dark-blue","dark-blue"],/\.ssh[\/\\][^\/\\\s]+$/,0,true],
 ["v8-icon",["medium-blue","medium-blue"],/^(?:[dv]8|v8[-_.][^.]*|mksnapshot|mkpeephole)$/i,0]],
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