feat: add git diff syntax highlighting (#39)

* feat: add git diff syntax highlighting

* fix(diff): change position to peach

* fix(diff): swap command/filename colors

* fix(diff): filenames (HEADER) to pink

Author: jack-mil

templates/editor.tera

@@ -56,6 +56,15 @@ whiskers:
             <WordsStyle name="PREPROCESSOR COMMENT" styleID="23" fgColor="{{ blue.hex }}" bgColor="{{ base.hex }}" fontName="" fontStyle="0" fontSize="" />
             <WordsStyle name="PREPROCESSOR COMMENT DOC" styleID="24" fgColor="{{ blue.hex }}" bgColor="{{ base.hex }}" fontName="" fontStyle="0" fontSize="" />
         </LexerType>
+        <LexerType name="diff" desc="diff file" ext="">
+            <WordsStyle name="DEFAULT" styleID="0" fgColor="{{ text.hex }}" bgColor="{{ base.hex }}" colorStyle="1" fontName="" fontStyle="0" fontSize="" />
+            <WordsStyle name="COMMENT" styleID="1" fgColor="{{ overlay2.hex }}" bgColor="{{ base.hex }}" colorStyle="1" fontName="" fontStyle="0" fontSize="" />
+            <WordsStyle name="COMMAND" styleID="2" fgColor="{{ blue.hex }}" bgColor="{{ base.hex }}" colorStyle="1" fontName="" fontStyle="1" fontSize="" />
+            <WordsStyle name="HEADER" styleID="3" fgColor="{{ pink.hex }}" bgColor="{{ base.hex }}" colorStyle="1" fontName="" fontStyle="0" fontSize="" />
+            <WordsStyle name="POSITION" styleID="4" fgColor="{{ peach.hex }}" bgColor="{{ base.hex }}" colorStyle="1" fontName="" fontStyle="1" fontSize="" />
+            <WordsStyle name="DELETED" styleID="5" fgColor="{{ red.hex }}" bgColor="{{ base.hex }}" colorStyle="1" fontName="" fontStyle="0" fontSize="" />
+            <WordsStyle name="ADDED" styleID="6" fgColor="{{ green.hex }}" bgColor="{{ base.hex }}" colorStyle="1" fontName="" fontStyle="0" fontSize="" />
+        </LexerType>
         <LexerType name="rust" desc="Rust" ext="">
             <WordsStyle name="DEFAULT" styleID="32" fgColor="{{ text.hex }}" bgColor="{{ base.hex }}" colorStyle="1" fontName="" fontStyle="0" fontSize="" />
             <WordsStyle name="WHITESPACE" styleID="0" fgColor="{{ overlay2.hex }}" bgColor="{{ base.hex }}" colorStyle="1" fontName="" fontStyle="0" fontSize="" />