Change KiCad Board language to KiCad Legacy Layout (#3799)

* Change KiCad Board language to KiCad Legacy Layout

KiCad .brd files and .kicad_pcb files have the same purpose, they are both source files for PCB layouts. Having one of the file types named "KiCad Board" and the other one "KiCad Layout" can cause confusion since it implies they are not the same thing.

The [.brd files use the old, legacy layout format](http://kicad-pcb.org/help/file-formats/#_native_file_formats) that is [not actively used anymore](https://github.com/search?utf8=%E2%9C%93&q=language%3A%22KiCad+Board%22&type=Repositories&ref=advsearch&l=KiCad+Board&l=). Having it come before the KiCad Layout language in the Language Selection list and not having it flagged as legacy can cause people to select it when searching for KiCad layout files.

* Change KiCad sample according to changes in 4b306f34

* Update vendor/README.md using script/list-grammars

lib/linguist/languages.yml

@@ -2149,13 +2149,6 @@ KRL:
   tm_scope: none
   ace_mode: text
   language_id: 186
-KiCad Board:
-  type: data
-  extensions:
-  - ".brd"
-  tm_scope: source.pcb.board
-  ace_mode: text
-  language_id: 140848857
 KiCad Layout:
   type: data
   aliases:
@@ -2171,6 +2164,13 @@ KiCad Layout:
   codemirror_mode: commonlisp
   codemirror_mime_type: text/x-common-lisp
   language_id: 187
+KiCad Legacy Layout:
+  type: data
+  extensions:
+  - ".brd"
+  tm_scope: source.pcb.board
+  ace_mode: text
+  language_id: 140848857
 KiCad Schematic:
   type: data
   aliases:

vendor/README.md

@@ -180,8 +180,8 @@ This is a list of grammars that Linguist selects to provide syntax highlighting
 - **JSX:** [github-linguist/language-babel](https://github.com/github-linguist/language-babel)
 - **Julia:** [JuliaEditorSupport/Julia.tmbundle](https://github.com/JuliaEditorSupport/Julia.tmbundle)
 - **Jupyter Notebook:** [textmate/json.tmbundle](https://github.com/textmate/json.tmbundle)
-- **KiCad Board:** [Alhadis/language-pcb](https://github.com/Alhadis/language-pcb)
 - **KiCad Layout:** [Alhadis/language-pcb](https://github.com/Alhadis/language-pcb)
+- **KiCad Legacy Layout:** [Alhadis/language-pcb](https://github.com/Alhadis/language-pcb)
 - **KiCad Schematic:** [Alhadis/language-pcb](https://github.com/Alhadis/language-pcb)
 - **Kit:** [textmate/html.tmbundle](https://github.com/textmate/html.tmbundle)
 - **Kotlin:** [vkostyukov/kotlin-sublime-package](https://github.com/vkostyukov/kotlin-sublime-package)